Finished in 1943, the Pentagon is a symbol of U.S. military might. It's also one of the places attacked on 9/11.
Construction on the Pentagon started on Sept. 11, 1941, in the midst of World War II. The five-sided design was chosen to accommodate existing roads around the building's original site near Arlington National Cemetery; a different site was ultimately picked, but the design was kept, according to the History Channel.
Many foods that you think have health benefits may hold hidden dangers for your diet.
It may be hard to believe, but it's already been 25 years since the likes of Sinéad O'Connor, Wilson Phillips and Vanilla Ice topped the charts. Take a look back at who else produced the top pop hits of 1990.