A fortified city, home to a remaining population of five families

Unique pagan culture in three extremely remote mountain valleys.

This "floating railway" is one of the world's oldest monorail systems.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

When construction began on this hotel, developers were surprised to find the ruins of an ancient civilization.

Legend says this sacred tree was a gift from goddess Athena.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

These ancient ruins hide in plain sight next to a dessert shop.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

This museum pays tribute to the Cherokee leader who created a written language for his people.

A rather vulgar example of the transition from Latin to the Italian vernacular.

The final resting place of one of Germany's most accomplished Renaissance men.

These abandoned Cold War-era bunkers are now a designated refuge for endangered bat species.

Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

Sloth rehabilitation center in the jungle of Costa Rica.

Dine inside a giant caterpillar at this community-run eatery.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Some of the freshest vegetables in Seoul are grown in a subway station.

Journey through a mesmerizing array of board games inside this museum.

This German museum is devoted to all aspects of grave culture from headstones to coffins.

Once an aquarium, this sanctuary now rescues sharks and rays from fishing nets.

A hidden oasis in the heart of Minneapolis is also an Important Bird Area.

This museum explores the history and development of dentistry and dental technology in Michigan.

This beautiful and unmissable little museum is full of fascinating artifacts from Mesoamerica's great civilizations.