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I want to know about the Pentagon.
Pentagon-The Pentagon is the seat of the US Department of Defense, located in Arlington, near Washington, USA. Seen from the air, this building is a regular Pentagon, hence the name "Pentagon".

It covers an area of 2.359 million square meters with a total construction area of 608,000 square meters. The length of each side of the external wall is 28 1 m. It covers an area of about 344,000 square meters and costs $87 million. Designed by Bogestrom and completed in 1943 15 10/0/6. When completed, it was the largest office building in the world, with 23,000 people working here. 1943 opened in May. It is 22 meters high and has five floors. Layer by layer, each layer is smaller than the next, and it is connected by many corridors to form a whole. The innermost part is a big garden covering an area of about 30 acres. There are large parking lots on the north and south sides of the building, which can simultaneously park 65,438+00,000 cars.

In the picture, there are many military Hummers parked in the parking lot, and helicopters are constantly patrolling in the air. It is said that this is one of the defensive measures added after 9 1 1.

1947 In September, the Department of Defense established by Truman, the 33rd President of the United States, began to work here. Since then, the Pentagon has become synonymous with the US Department of Defense. In addition to the Ministry of National Defense, the building also includes the Joint Chiefs of Staff and the headquarters of the army, navy and air force.

There are banks, post offices, bookstores, clinics, telegraph offices and various shops and service industries in the lobby on the first floor of Wujiao, just like a dazzling market. Its entertainment facilities are more luxurious and complete, including steam bath, swimming pool, decompression room, gym, massage room, library, chapel and 280 advanced and comfortable lounges. The Joint Chiefs of Staff, known as the "Soul of the Department of Defense", is on the second floor. The office building on this floor is covered with a golden carpet and is called the "Golden Hall". The office of the Secretary of Defense and the War Department are on the third floor. Above the third floor are the Admiralty and the Air Force. A part of the corridor on each floor is reserved for exhibitions, including photos, oil paintings, charts and portraits of military generals of various services and arms, models of various ships, planes and guns, and various American flags, military flags and state flags since the founding of the People's Republic of China. There is a "Hero Hall" in the corner of the corridor on the third floor to commemorate the winner of the "highest medal of honor" since the War of Independence. There are more than 3,000 bronze medals engraved with their names, places of origin and resumes. There is also Marshall, Eisenhower and MacArthur's "Memorial Corridor", which displays their photos, military uniforms, medals, pistols, as well as their signed orders and cultural relics. On both sides of the corridor open to tourists in the Pentagon, the office doors are open. Visitors can see the hard-working male and female officers and civilians inside. Staff members pass documents to tourists from time to time. The atmosphere in the building looks relaxed, but the confidentiality here is still very strict. Any waste paper is not allowed to be taken out and must be put into a special bag for destruction. There is a yellow line on the floor of the corridor. You have to show a special pass to get there.

The transportation of the Pentagon extends in all directions, including highway network, helipad and subway station leading to large parking lots. There are 150 elevators, 13 elevators and 19 escalators in the building. Three employees manage and maintain 4,200 electric clocks, and the switchboard has to transfer 200,000 calls every day.

1993 May 12 The U.S. Department of the Interior designated the Pentagon as a symbol of national history and awarded it a medal.

Traditionally, most of the buildings in this building are open to tourists from Monday to Friday (except federal holidays). Every day, tourists are received in batches, with 20 or 30 people in each batch, led by tour guides in military uniforms, and collectively tour along the scheduled route. The tour guides here all walk backwards, so that they can face the tourists and explain while walking, and it is also convenient to monitor the tourists.