Mysterious rocks that ring musically when struck.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

The world's only museum devoted to the wonders of fluorescence.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

An exquisite tunnel of cascading flowers.

Abandoned railway line circling the city of Paris.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A layered tribute to the work of mosaicist Isaiah Zagar.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A magical place that lets you play in and explore the world of Studio Ghibli.

A psychedelic labyrinth on the San Francisco bay.

World's largest collection of serial killer artwork and other macabre exhibits.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Hot springs monkey spa in the middle of Hell's Valley.