Pentagon

The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia, across the Potomac River from Washington, D.C. It is one of the world's largest office buildings.

The Pentagon was designed by American architect George Bergstrom (1876–1955), and built by general contractor John McShain of Philadelphia. Ground was broken for construction on September 11, 1941, and the building was dedicated on January 15, 1943. General Brehon Somervell provided the major motive power behind the project; Colonel Leslie Groves was responsible for overseeing the project for the U.S. Army.

On September 11, 2001, exactly 60 years after the building's construction began, American Airlines Flight 77 was hijacked and flown into the western side of the building, killing 189 people (59 victims and the five perpetrators on board the airliner, as well as 125 victims in the building). It was the first significant foreign attack on Washington's governmental facilities since the city was burned by the British during the War of 1812.

Pentagon in The Hot War
The Pentagon was hit the by the second atomic bomb which the Soviet Union dropped on Washington, DC in May 1952. Only part of one side of the five remained standing.