The so-called "world's shortest river" is actually a window into a cave.

Visitors flock to see this church tower's unintended feature: It happens to resemble a giant chicken from multiple points of view.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

Cave on extinct volcano, once home to famous mathematician Pythagoras.

Poseidon? No one seems to know.

A little-known park with unusual, half-ruined structures and a mystical energy.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

This legendary city has been a tourist attraction for centuries.

A naturally beautiful, seemingly bottomless deep blue spring.

A spectacular cave and a beguiling lake.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

The hallucinogenic center of the ancient world.

Ancient Greek oracle of the dead.

Monasteries on rock pillars, once accessible only by frayed ropes.

A humid oasis combines recreation with exploration in a unique underwater cavern.

The only Florida state park with publicly accessible caves.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

For divers and music lovers, the Florida Keys' Underwater Music Festival provides the best of both worlds.

An underwater statue of Christ blesses the depths off Key Largo.

Stay in a room with a view... of the bottom of the ocean.

This fairytale-inspired cottage was created by a university literature professor.

An underwater city for the dead.

The abandoned bathhouse is all that remains of the hot springs considered Florida's original tourist attraction.