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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

Tucked in the back of this amazing antique store is an important piece of medical history.

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

These fantastically named natural pools look like something out of a Scottish myth.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

An emerald-green grotto just a short trip from Austin.

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

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

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

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

A snapshot of the city's fascinating voodoo culture.

On Japan's Tashirojima Island, cats are king.

An exquisite tunnel of cascading flowers.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A crumbling hospital from the 1850s on Roosevelt Island.

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

World's first "penitentiary," meant to be humane, drove men insane.

A kaleidoscopic warehouse-maze of handmade neon signs.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

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

A psychedelic labyrinth on the San Francisco bay.

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