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

Giant granite rocks standing end-to-end like a train of circus elephants.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

A subterranean haunt where wine and homemade biscottis are always on the menu.

The hometown of Popeye's creator is littered with a growing collection of granite cartoon characters.

Man-made geyser that rises to the exact height of the Gateway Arch.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

An unknown Hall of Fame in Jackson, Tennessee.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This historic train station has been converted to a locomotive themed hotel.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

The only Florida state park with publicly accessible caves.