This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This private residence was the template for one of the most beloved television homes of all time.

New fungal and bacterial species call this deadly lake home.

A bit of retro transportation flair preserved in the world's largest department store.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This giant meditative chakra sits peacefully in the Flathead Valley of western Montana.

A memorial to the most decisive Native American victory of the Plains Indian War.

One man's ambition created this psychedelic log home.

At the time of its completion, it was the tallest dam in the world.

Cabins once lived in by Butch Cassidy and the Sundance Kid are featured at this Old West living history museum.

An unusual geological feature towers over the remains of a dark episode in United States history.

Native Americans built this circle of stones, which was used to predict astronomical events.

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

An entire town preserved as a historic landmark.

These giant metal horses graze on a hilltop near the Montana highway.

The source of America's longest river is also a historical landmark and the start of a famous nude run.

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

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