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34-596: It lies in the Western Hills of Beijing and is mountainous in terrain. In fact, the mountainous terrain—including a hundred or more peaks—occupy a stunning 93% of the entire area. Mentougou District is gaining popularity as a tourist destination. Among its main sights are Jietai Temple , Tanzhe Temple , Longmen Gully (or Canyon), Mount Baihua, Mount Ling (the highest mountain in Beijing at 2,303 metres), Mount Miaofeng, and Cuandixia Village. The 6th Ring Road runs through

68-472: A pillbox can be killed with flamethrowers . Complex, well-built and well-protected fortifications are often vulnerable to attacks on access points. If the exits to the surface can be closed off, those manning the facility can be trapped. The fortification can then be bypassed. Famous bunkers include the post-World War I Maginot Line on the French eastern border and Czechoslovak border fortifications mainly on

102-453: A house is purpose-built with a bunker, the normal location is a reinforced below-ground bathroom with fiber-reinforced plastic shells. Bunkers deflect the blast wave from nearby explosions to prevent ear and internal injuries to people sheltering in the bunker. Nuclear bunkers must also cope with the underpressure that lasts for several seconds after the shock wave passes, and block radiation . A bunker's door must be at least as strong as

136-401: A house is purpose-built with a bunker, the normal location is a reinforced below-ground bathroom with large cabinets. One common design approach uses fibre-reinforced plastic shells. Compressive protection may be provided by inexpensive earth arching. The overburden is designed to shield from radiation. To prevent the shelter from floating to the surface in high groundwater, some designs have

170-400: A narrow, 1–2-metre (3.5–6.5 ft), flexible tent of thin wood is placed in a deep trench, and then covered with cloth or plastic, and then covered with 1–2 m (3.5–6.5 feet) of tamped earth. A large ground shock can move the walls of a bunker several centimeters in a few milliseconds. Bunkers designed for large ground shocks must have sprung internal buildings to protect inhabitants from

204-515: A part of a trench system. Such bunkers give the defending soldiers better protection than the open trench and also include top protection against aerial attack. They also provide shelter against the weather. Some bunkers may have partially open tops to allow weapons to be discharged with the muzzle pointing upwards (e.g., mortars and anti-aircraft weapons). Many artillery installations, especially for coastal artillery , have historically been protected by extensive bunker systems. These usually housed

238-637: A purpose similar to the United States Military 's Pentagon . Mao Zedong briefly lived in the Western Hills, and the Politburo of the Chinese Communist Party retreated there briefly in 1989. The Kuomintang (KMT) also had a secret group named Western Hills, established in 1925. Revolutionary Sun Yat-sen 's coffin was kept there, with the group's members being Buddhist, believing that

272-628: A reinforced concrete shelter" is first recorded on 13 October 1939, in "A Nazi field gun hidden in a cemented 'bunker' on the Western front". All the early references to its usage in the Oxford English Dictionary are to German fortifications. However, in the Far East the term was also applied to the earth and log positions built by the Japanese, the term appearing in a 1943 instruction manual issued by

306-522: A skirt held down with the overburden. It may also serve the purpose of a safe room . Large bunkers are often bought by super rich individuals in case of political instability , and usually store or access large amounts of energy for use. They are sometimes refereed to as "luxury bunkers," and their locations are often documented. Munitions storage bunkers are designed to securely store explosive ordnance and contain any internal explosions. The most common configuration for high explosives storage

340-578: Is 568.1 mm (22.37 in) with July as the wettest month. The temperatures are highest on average in July, at around 26.2 °C (79.2 °F), and lowest in January, at around −3.4 °C (25.9 °F). Western Hills The Western Hills ( Chinese : 西 山 ; pinyin : Xīshān ) are the hills and mountains in the western part of Beijing . Being an extension of the Taihang mountain range from

374-417: Is an unusually large number of bunkers because of a law requiring protective shelters to be constructed for all new buildings since 1963, as well as a number of bunkers built as part of its National Redoubt military defense plan. Some of Switzerland's bunkers have since become tourist attractions housing hotels and museums such as Sasso San Gottardo Museum. The Soviet Union maintained huge bunkers (one of

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408-490: Is the igloo shaped bunker. They are often built into a hillside in order to provide additional containment mass. A specialized version of the munitions bunker called a Gravel Gertie is designed to contain radioactive debris from an explosive accident while assembling or disassembling nuclear warheads . They are installed at all facilities in the United States and United Kingdom which do warhead assembly and disassembly,

442-628: The British Indian Army and quickly gaining wide currency. By 1947 the word was familiar enough in English that Hugh Trevor-Roper in The Last Days of Hitler was describing Hitler's underground complex near the Reich Chancellery as "Hitler's own bunker" without quotes around the word bunker. This type of bunker is a small concrete structure, partly dug into the ground, which is usually

476-542: The Cold War for weapons facilities, command and control centers, and storage facilities. Bunkers can also be used as protection from tornadoes . Trench bunkers are small concrete structures, partly dug into the ground. Many artillery installations, especially for coastal artillery , have historically been protected by extensive bunker systems. Typical industrial bunkers include mining sites, food storage areas, dumps for materials, data storage, and sometimes living quarters. When

510-586: The Hebei Province, the Western Hills cover approximately 17% of the Beijing municipality, including most of the Mentougou and Fangshan Districts as well as parts of Changping , Haidian , and Shijingshan . The elevation of the Western Hills range is between 100 m to over 1900 m above sea level and is visible from the city on clear days. A mix of deciduous and coniferous forests and highland meadows cover much of

544-595: The Fragrant Hills Park are Jiufeng (Vulture Peak) Forest Park (鹫峰森林公园), Dajue Temple , and Fenghuanling (Phoenix Ridge) Scenic Area. South of the Fragrant Hills Park is Badachu (八大处; literally "eight great sites") in Shijingshan District, which is named after eight Buddhist temples and monasteries. The Western Hills of Shijinghan are also home to the Laoshan Mountain Bike Course , where

578-643: The Germans to describe permanent structures both large ( blockhouses ), and small ( pillboxes ), and bombproof shelters both above ground (as in Hochbunker ) and below ground (such as the Führerbunker ). The military sense of the word was imported into English during World War II, at first in reference to specifically German dug-outs; according to the Oxford English Dictionary , the sense of "military dug-out;

612-574: The Western Hills. Mountain streams feed into the Yongding and Juma Rivers, which flow through the Western Hills to irrigate the plains of Beijing. Coal is mined in Fangshan and Mentougou Districts. Natural and historical points of interest include river gorges, and hot springs, as well as temples, historic homes, secluded retreats and ancient ruins. Also known as the Western Hills Scenic Area,

646-528: The area has long been used as a retreat by Chinese scholars, religious men, and members of the government and civil service. Nearest to Beijing's Haidian District is the Fragrant Hills Park. Nearby is the Beijing Botanical Garden and Temple of Azure Clouds . The Wofo Temple , which has a giant reclining Buddha statue , is located on the grounds of the botanical gardens. To the northwest of

680-452: The blast wave or a reflection cannot lift the edge. A bunker should have two doors. Door shafts may double as ventilation shafts to reduce digging. In bunkers inhabited for prolonged periods, large amounts of ventilation or air conditioning must be provided in order to prevent ill effects of heat. In bunkers designed for war-time use, manually operated ventilators must be provided because supplies of electricity or gas are unreliable. One of

714-577: The cargo of a ship". In the 19th century the word came to describe a coal store in a house, or below decks in a ship. It was also used for a sand-filled depression installed on a golf course as a hazard. In the First World War the belligerents built underground shelters, called dugouts in English , while the Germans used the term Bunker . By the Second World War the term came to be used by

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748-428: The crews serving the weapons, protected the ammunition against counter-battery fire, and in numerous examples also protected the guns themselves, though this was usually a trade-off reducing their fields of fire. Artillery bunkers are some of the largest individual pre-Cold War bunkers. The walls of the ' Batterie Todt ' gun installation in northern France were up to 3.5 metres (11 ft) thick, and an underground bunker

782-511: The eastern part of Mentougou District. Mentougou District is served by one line of the Beijing Subway . There are 4 subdistricts and 9 towns (including 3 towns of which carry the "area" label): Mentougou District has a humid continental climate ( Köppen climate classification Dwa ). The average annual temperature in Mentougou is 12.5 °C (54.5 °F). The average annual rainfall

816-554: The largest being the Pantex plant in Amarillo, Texas , which has 12 Gravel Gerties. Bunkers deflect the blast wave from nearby explosions to prevent ear and internal injuries to people sheltering in the bunker. While frame buildings collapse from as little as 21  kPa (3  psi ; 0.21  bar ) of overpressure , bunkers are regularly constructed to survive over 1,000 kPa (150 psi; 10 bar). This substantially decreases

850-513: The likelihood that a bomb (other than a bunker buster ) can harm the structure. The basic plan is to provide a structure that is very strong in physical compression . The most common purpose-built structure is a buried, steel reinforced concrete vault or arch . Most expedient blast shelters are civil engineering structures that contain large, buried tubes or pipes such as sewage or rapid transit tunnels. Improvised purpose-built blast shelters normally use earthen arches or vaults. To form these,

884-504: The most efficient manual ventilator designs is the Kearny Air Pump . Ventilation openings in a bunker must be protected by blast valves . A blast valve is closed by a shock wave, but otherwise remains open. One form of expedient blast valve is worn flat rubber tire treads nailed or bolted to frames strong enough to resist the maximum overpressure. Bunkers can be destroyed with powerful explosives and bunkerbusting warheads. The crew of

918-607: The mountain biking competition of the 2008 Summer Olympic Games was held. Fossils of the Peking Man were discovered in the caves of Dragon Bone Hill near Zhoukoudian in Fangshan District. The Western Hills also houses an underground command center of the Chinese military , a secret bunker -like underground facility built with the assistance of the USSR in the 1950s, which now serves

952-962: The northern Czech border facing Germany (but to lesser extent all around), Fort Eben-Emael in Belgium, Alpine Wall on the north of Italy, World War II Führerbunker and in Italy, industrial Marnate's Bunker , the V-weapon installations in Germany ( Mittelwerk ) & France ( La Coupole , and the Blockhaus d'Éperlecques ) and the Cold War installations in the United States ( Cheyenne Mountain Complex , Site R , and The Greenbrier ), United Kingdom ( Burlington ), Sweden ( Boden Fortress ) and Canada ( Diefenbunker ). In Switzerland, there

986-759: The presence of Sun Yat-sen's body could bless them. The group had a political goal of ousting the Communist Left, headed by Mikhail Borodin , from the KMT. 39°59′27″N 116°10′21″E  /  39.9908°N 116.1725°E  / 39.9908; 116.1725 Bunker A bunker is a defensive military fortification designed to protect people and valued materials from falling bombs, artillery, or other attacks. Bunkers are almost always underground, in contrast to blockhouses which are mostly above ground. They were used extensively in World War I , World War II , and

1020-632: The secondary uses of the very deeply dug Moscow Metro and Kyiv metro systems was as nuclear shelters). A number of facilities were constructed in China, such as Beijing 's Underground City and Underground Project 131 in Hubei ; in Albania , Enver Hoxha dotted the country with hundreds of thousands of bunkers . In the United States, the Presidential Emergency Operations Center underneath

1054-409: The walls and floors. Nuclear bunkers must also cope with the underpressure that lasts for several seconds after the shock wave passes, and block radiation . Usually, these features are easy to provide. The overburden ( soil ) and structure provide substantial radiation shielding, and the negative pressure is usually only 1 ⁄ 3 of the overpressure. The doors must be at least as strong as

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1088-437: The walls. In bunkers inhabited for prolonged periods, large amounts of ventilation or air conditioning must be provided. Bunkers can be destroyed with powerful explosives and bunker-busting warheads . The word bunker originates as a Scots word for "bench, seat" recorded 1758, alongside shortened bunk "sleeping berth". The word possibly has a Scandinavian origin: Old Swedish bunke means "boards used to protect

1122-407: The walls. The usual design is now starting to incorporate vault doors . To reduce the weight, the door is normally constructed of steel, with a fitted steel lintel and frame. Very thick wood also serves and is more resistant to heat because it chars rather than melts. If the door is on the surface and will be exposed to the blast wave, the edge of the door is normally counter-sunk in the frame so that

1156-653: Was constructed for the V-3 cannon . Typical industrial bunkers include mining sites, food storage areas, dumps for materials, data storage, and sometimes living quarters. They were built mainly by nations like Germany during World War II to protect important industries from aerial bombardment . Industrial bunkers are also built for control rooms of dangerous activities, such as tests of rocket engines or explosive experiments. They are also built in order to perform dangerous experiments in them or to store radioactive or explosive goods. Such bunkers also exist on non-military facilities. When

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