A castle built for love, and abandoned due to heartbreak.

This tiny little island has, as the name says, just enough room for its single house.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

A field of nothing but boulders which resembles a giant's gravel driveway.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

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

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

This museum glorifies the humble potato.

Home to the deepest rift anywhere on Earth.

The fifth-longest natural arch in the world, and the longest outside China.

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

A house carved into a rock in the 1940s.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

The largest source of fossilized insects anywhere.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

When ecosystems collide in the arid Southwest.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.