What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

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

Race through the maze, get your name on the sign.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Oldest building in California still in use.

Megachurch turned Catholic church comprised of 10,000 glass panes.

Home to the "Circus" trees created by Axel Erlandson.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

World's second largest particle accelerator, where nature reveals its secrets.

These pretty kitties killed and ate as many as 135 railway workers.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

A historic coal mine that doubles as a museum and tourist attraction.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

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

Taxidermy, Cigar Store Indians, A Model of a New York Tenement and Delicious Draft Root Beer.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.