Pentagon
The Pentagon is a large five-sided building located in Arlington County, Virginia, near Washington, DC. It is the headquarters of the US Department of Defense and includes all three military departments of the Army, Navy, and Air Force.
The Pentagon was built in 1941–43 to consolidate the offices of the Department of War, which already occupies 17 separate facilities across Washington.
Although President Franklin Roosevelt initially preferred windows less buildings to protect them from potential air strikes, he was later persuaded by construction engineers that such facilities were impractical.
As the country began construction in September for only three months, the country entered World War II in December 1941, so the completion of this building became a national priority.
More than 13,000 workers worked day and night, and in just eight months of groundbreaking, Secretary of War Henry Stimson moved the office to the new factory.
The Pentagon was completed in January 1943 at a cost of $83 million. It is the largest office building in the world, covering 29 acres including a 5-acre central court, covering an area of approximately 3.7 million square feet of usable space that can accommodate about 25,000 people.
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The structure is made of steel and reinforced concrete with some limestone finishes.
The structure has five floors, excluding the mezzanine and basement. It is composed of five concentric pentagons and ten spoke-like corridors connect the whole.
The corridor is 17.5 miles long, but due to its innovative construction, it can be walked between any two points in the building in about 7 minutes.
Several libraries are used as military research facilities, and these knowledge bases subscribe to more than 1,700 periodicals in multiple languages.
There are also two cafeterias, one restaurant and seven snack bars. There are 67 acres of parking lot that can accommodate about 8,700 cars.
The bus and taxi terminal is located under a huge hall with a Pentagon staff shopping center. The Washington Metro Line also served the facility, and a heliport was added in 1956.
On the 60th anniversary of the Pentagon’s groundbreaking in 2001, five terrorists hijacked a commercial airliner and drove it into the building in the September 11 attack. The southwest part of the building was destroyed, and 189 people including terrorists were killed. The damage was repaired within a year.
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