Places Jochen Duckeck Wants to Go

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

A museum to a cave explorer whose tragic death was a media sensation, and whose corpse became a tourist attraction.

Deep below the dry landscape of Bahia, a cave with intense blue water to float in.

The glowing blue Nymphaeum of Emperor Tiberius.

This natural sea cave hides a small wonderland of natural turquoise beauty.

This vast, water-filled underground labyrinth can only be toured by boat.

Wondrous stalactites house thousands of bats in these African caves.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

These otherworldly caverns form Earth's oldest known cave system.

This Turkish cave boasts some rather bizarre associations with the King of Mount Olympus.

The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

A 2,000-year-old engineering wonder hides beneath an Italian town.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

This exhibit allows visitors to wander through the interior of a replica Ice Age glacial cave.

Designed as a labyrinth, this subterranean prison was crafted without bars or doors.

This forgotten chalk mine was reopened thanks to a massive effort from the local community.

A southern Swedish island is home to the last ERSTA artillery battery, meant to protect the shoreline during the Cold War.

Crossing a suspension bridge above a forest is the only way to reach this 12th-century monastery.

Hidden in a metro shop under a shopping mall, this small museum tells the story of one of the world's largest urban transit systems.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

These artificial caves crafted by ancient Romans were elaborate fish farms for moray eels.

A 22-million-year-old sandstone cave is a natural habitat for award-winning cheese.

A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.