America's National Security Symbol: PENTAGON 

The Pentagon, the headquarters of the US Department of Defense, is one of the largest office buildings in the world.

A symbol of America's national security, this building is known for its unique architectural design. The building was originally intended to be built on a different site, bordered on five sides by roads. President Roosevelt was concerned that if the building was built in that location, it would block the view of Arlington Cemetery. So the Pentagon was built on a different site, but the pentagonal design was retained.

The Fine Arts Commission, which at the time advised the President and Congress on federally funded buildings, opposed the building. Gilmore Clark, who headed the commission, called it "one ofthe most serious and worst assaults on Washington's plan." But World War II had broken out and a building to house the then War Department was needed.

The Pentagon was originally intended to be temporary.

The building was designed in the early 1940s to provide a temporary solution to the War Department's space shortage as the threat of World War II approached America.

In 1941, construction began. During construction it was planned to convert the building into a hospital, office or warehouse after the Second World War.

Construction took 16 months and was completed in January 1943. In total, 1,000 architects and 14,000 workers worked on the design and construction. The building used 43,000 tons of steel and 680,000 tons of sand and gravel.

At the height of the Second World War, the building housed more than 33,000 people.

Colonel Leslie Groves was in charge of the building's construction. At the time, Groves worked six days a week in his office in Washington and visited the Pentagon construction site on Sundays. He said that during his time there he 'hoped to go to the battlefield to find some peace'. Soon after, he was assigned to direct the 'Manhattan Project', the atomic bomb project headed by J. Robert Oppenheimer.

The building remained in place after the war.

As the Pentagon's capacity exceeded expectations, the authorities were convinced that the building should be used after the war. Thus, the building was not converted into another structure and remained the command center of the US military.

Today, the building houses the offices of the Minister of Defense, the General Staff, and the Army, Air Force and Navy.

The Pentagon is one of the largest office buildings in the world.

This building has 6,500,000 square meters of office space. That's three times the floor space of the Empire State Building. There are 7754 windows in the building, and when you add the corridors end to end, it is about 30 kilometers long. But thanks to its pentagonal design, it takes only 7 minutes to walk between the two farthest points.

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