A crumbling hospital from the 1850s on Roosevelt Island.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

For decades, it has disappeared and reappeared as water levels rise and fall.

This riverside restaurant has been serving customers since 1146.

This spectacular track has run continuously since 1882.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

This hidden bridge is where local children leave gifts and messages for the island's fay folk.

Historical figures from New York City's Catholic community reside in Midtown.

This ancient Irish landscape boasts hundreds of legendary ruins.

The plunge pool is a surviving relic of a rowdy royal residence.

Wander among the abandoned ruins of this once-powerful medieval town.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

This landmark Victorian folly rewards visitors with spectacular views over the Peak District.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

A little-known ruin with a convoluted history and a fascinating latrine drainage system.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

These planks were originally installed to hold the dead.

Legend says a witch conjured the world's third largest whirlpool to protect Scotland from a nasty pirate.

Odd outsider art installations surround a Gold Rush-era ghost town.

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

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.