The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

This enigmatic building features numerous architectural styles.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

Is this 47.7-mile stretch of highway the longest straight road in the United States?

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

This spot in St. Louis, marked with a simple sign, has seen more pro baseball than just about anywhere else in the world.

This historic theater's pipe organ still accompanies silent films just like it did in 1929.

The modest childhood home where the baseball legend and Yankees star learned to hit from both sides of the plate.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

Located along historic Route 66, this former gas station has been restored and converted into a museum filled with vintage motorcycles.