An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

An abandoned relic of the city's failed experiment with below ground transit.

This abandoned fort is said to be the most haunted place in India, so much so that entry is prohibited after sunset.

A museum dedicated to exhibiting remarkable outsider art.

One of the smallest towns in the United States.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

This supermarket in Shanghai appears to be a typical Chinese convenience store, but all of the bottles are empty and all the containers are filled with nothing but air.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

Austria's very first and only nuclear power station was completed but never used.

Caves full of Buddhist statues, incredible rock formations and a deserted lagoon.

A subterranean playground in an abandoned slate mine.

Vietnam's feral abandoned water park offers access to a post-apocalyptic funscape, now with fewer crocodiles.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

The only surviving prototype for Buckminster Fuller's house of the future.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

This town near Nagasaki is flecked with fruit-flavored bus stops.

This magnificent blue mosque in Afghanistan is surrounded by thousands of white doves.

The other side is actually green.

A cozy cafe tells the remarkable story of how one man started with a little red paperclip and wound up with an entire house.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

The atmospheric road was never meant to be so creepy.