Take a dip in the world's largest mineral hot springs pool.

This remote Colorado canyon is home to the second-largest collection of natural arches in the world.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

This Colorado fire station has been in continuous operation for more than a century.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

Step inside Lucy, the world's largest "elephant."

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

World War II bunker still standing on the New Jersey beach.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Nikola Tesla's former home contains an homage hidden from plain sight.

Abandoned silver mine strewn with wrecked and twisted structures.

This spectacular track has run continuously since 1882.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

The final resting place of a space program monolith.

The highest bridge in America was built for an almost unnervingly small amount of money.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

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