A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

A natural wonder in south Denmark.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The Liverpool street made famous by the Beatles is real.

Don't blink or you'll miss it.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

An abandoned settlement originally established by British colonialists in the Andaman archipelago.

This Canadian island is a veritable garden of decay with countless abandoned structures dotting the landscape.

Remains of an abandoned coral city.

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

The only gulag ever to exist in socialist Yugoslavia.

A whimsical bridge adorned with decorative dragons.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

During World War II, this rice mill became a Nazi concentration camp.

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

This Ukraine alleyway has become its own little island of forgotten things.

This abandoned mining village was predicted to resist decay longer than any other modern human settlement.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.