A pentagon is a closed shape with 5 straight sides. This building is in the shape of a pentagon. It is also called The Pentagon. It is the headquarters of the United States Department of Defense. It was built in Arlington, Virginia, in 1943.
There are many other government buildings in northern Virginia. The main office of the Central Intelligence Authority (CIA) is in Langley, Virginia. The CIA gathers information to help keep the country safe.
The Federal Bureau of Investigation (FBI) has its main training academy in Quantico, Virginia. The FBI works to investigate crimes.
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