Did an alien spaceship crash in Roswell, New Mexico in 1947? Are scientists reverse-engineering extraterrestrial technology in the Nevada desert's Area 51? Conspiracy theorists have no doubts. But the facts tell a very different story.

Myths surround the landmarks of Washington, D.C. Few realize that the remains of the original White House are buried under a baseball diamond in Virginia or that thousands of people have literally jumped over the top of the Washington Monument.