The Pentagon is the headquarters of the United States Department of Defense

It is located in Washington DC.

It is a a symbol of the U.S. military.

The Pentagon is a large building, with about 600,000 m2, of which 340,000 m2 are used as offices.

About 10,000 employees work there.

It has seven sides.

Its central plaza, which is shaped like a pentagon, is informally known as "ground zero,"

The construction of the Pentagon was done during the period of racial segregation in the United States.

The 60th anniversary of The Pentagon's groundbreaking was on September 11, 2001.

On August 23, 2011, a 5.8 magnitude earthquake caused major damage to the Pentagon.