The Pentagon is the world's largest office building. It has a total floor area of 6.5 million square feet.
There are 17.5 miles (28 km) of corridors in the Pentagon, and it is possible to walk from any one point in the building to any other point in about seven minutes.
The Pentagon is surrounded by a 13-foot (4 m) high security fence. The fence is topped with barbed wire and is monitored by cameras and guards.
The Pentagon is home to about 23,000 military and civilian employees
The Pentagon was attacked on September 11, 2001, by a hijacked American Airlines Flight 77.
The Pentagon is a symbol of the U.S. military and a reminder of the sacrifices that have been made to protect our country.
The Pentagon is a popular tourist destination. Visitors can take a free tour of the building, which includes a visit to the Pentagon War Room.
The Pentagon is a work in progress. The building is constantly being updated and improved, and it will continue to be a vital part of the U.S. military for many years to come.