Here are some interesting facts regarding The Pentagon:
1. It is the largest office building in the world based on floor space alone.
2. There are 17 1/2 miles of hallways within The Pentagon.
3. It is so huge it is assigned six different zip codes.
4. 23,000 people work within its walls.
5. The glass panes in The Pentagon are two inches thick and weigh 1 ton each. The windows do not open.
6. The attack of Sept 11th 2001 happened exactly 60 years to the day from when the ground was broke for construction.
7. It took only 16 months to be built and was finished on January 15th, 1943.