A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A cave's rare beauty held a cavernous secret hidden underground.

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.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

An operating lighthouse from the 1860s.

The large fjord lake is thought to be the home of "Ogopogo," a giant sea serpent.

"Girl in a Wetsuit" is what happens when a sculptor has to find a way around a 100 year old copyright.

This expansive bridge in the Canadian wilderness was originally just built for friends.

A quarter mile off the coastal tip of Maine you'll find the "Beloved Island" of Franklin Delano Roosevelt.

Twice a day, the water of the Petitcodiac River flows upstream in a surfable wave.

The 32nd president's sprawling cottage sits on an island enclave jointly managed by the U.S. and Canada.

A mysterious spot where the laws of gravity seem not to apply.

Iconic rock formations that allow for exploration during high or low tide.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.

Home of the world's smallest dinosaur footprints.

An urban laboratory.

A spiritual vortex among the red rocks in Sedona.

This 24-acre park offers a place for meditation in the midst of Sedona's iconic red rocks.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Bad farming practices caused this unnatural natural wonder.

A man's home is his castle.

The ruins of a paper mill destroyed during the Civil War still tower over a tributary of the Chattahoochee River.