A house carved into a rock in the 1940s.

A self-built castle made by a mysterious man.

A huge musical instrument played by the ocean.

A psychedelic labyrinth on the San Francisco bay.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

The largest piece of no man's land left on Earth.

One of only two civilian settlements in the desolate lands of chilly Antarctica.

Images chiseled into the basalt here date back an estimated 300 years.

A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

Watch the newest land on the planet form before your eyes.

At the point of oceanic inaccessibility, you can't get farther from dry land without leaving the planet.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

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

The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

"Looks so real, it's scary!"

Software company Epic Systems has created one of the strangest and largest workplaces of all time.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

A theme park attraction designed to turn your children into LARPers.

A remote hill on a stretch of country road where the laws of physics are defied... or so it seems.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

An underground wonderland in Iowa.