In Tucson a giant metal snake helps pedestrians cross a busy highway.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

Home of the International Space Hall of Fame.

This is one really big nut.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

A tunnel with windows, so you don't miss out on the impressive views.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Wee (and not so wee) footprints that insects and reptiles of the Paleozoic Era left behind.

The largest island on the great salt lake is home to curious creatures and strange stories.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

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

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

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

Forever immortalized in concrete, this Simpsons etching was crafted by show creator Matt Groening.

The magic's in the hole!

A wall of chewing gum moonlights as collective art.

A giant Troll lurks under one of Seattle's oldest bridges.

A walk through the historic city center, under the streets of Seattle.

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

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

Here, visitors can swing with the waves of the Pacific Ocean.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

A strange house built only at night, with rumored mystic inspiration.