The Pentagon is the headquarters of the United States Department of Defense and is located in Arlington, Virginia.
It was completed in 1943, and is the largest office building in the world in terms of floor area.
The building has five sides, five floors above ground, and two basement levels.
The Pentagon houses over 23,000 military and civilian personnel, and has its own shopping mall, food court, and bank.
The building was designed by architect George Bergstrom and engineer Leslie Groves, who oversaw the construction of the Manhattan Project.
The original name for the building was the War Department Building, but it was changed to the Pentagon in 1943.
The building was targeted by terrorists on September 11, 2001, and suffered significant damage.
The Pentagon has its own Metro station, which is located on the Blue and Yellow lines.
The building's corridors are color-coded to help visitors navigate its vast interior.
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