Curious cave that stays a cool 56 degrees all year long.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

The first park built over a freeway is a brutalist masterwork.

A beautiful bamboo trail tucked in this famous Japanese shrine.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

This 700-year-old street food market features baby octopus and soy donuts.

The 10,000 Torii shrine.

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

To find the "unicorns of the deep" you've got to go downstairs.

Robots, lasers, and whoopee cushions, oh my!

Hundreds of protractors affixed to surfaces all over the city.

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

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

The world's longest known cave system.

Ancient temple is home to centuries of art and spiritual artifacts.

A piece of John the Baptist in the American heartland.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

Community bookshelf of 25-foot-tall book spines.

In an odd geographic anomaly this city borders two different states on opposite sides of town.

The largest earthwork effigy in the world.