A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.

This frozen-in-time summer home outside Moscow provides a look at Russian life in the 1950s.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

Find out what it sounds like when doves cry at Prince's recording studio estate turned museum.

This quirky collection is an interactive exhibit crammed with creative contraptions and tinkered-with toys.

A magical museum of fairy tale treasures near Cyprus' buffer zone.

This terrifying glass bridge on the side of a mountain cracks as you step on it.

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

All aboard the world's longest miniature railway.

This Seattle joint serves food inside an old train car once used by FDR.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

An early-20th-century "dacha" village of quaint cottages curiously located in a modern part of Moscow.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

The home of pigs, snakes, chameleons, and the alleged largest bunny in the United States.

It was founded by Ralph Nader to educate the public about an often-maligned area of law.

Russia's giant concrete QWERTY keyboard is likely the largest in the world.

The subterranean sanctuary home to local shamans is a sacred site for people of all religions.

A former military outpost of Ivan the Terrible, the 16th-century church contains some of the rarest examples of Eastern Orthodox mural paintings.

An unusual abandoned church damaged in World War II sits in a small village outside Moscow.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

A sliver of nostalgia in Seattle's Viretta Park.

These sacred totem houses connect the Fatakulu people with the spirits of their ancestors.

The avant-garde design was able to bypass strict Soviet regulations on architecture.

One of the largest collections of socialist realist art shows the surprising depth of the official art of the Soviet Union.