Places Jochen Duckeck Wants to Go

The hellish conditions of this abandoned mine that snakes beneath the Pacific Ocean gave it its diabolic name.

This coastal rock formation resembles a churning cauldron at high tide.

Location of a royal cave rave in the 1800s, now largely forgotten.

A surprising and unconventional mosque hidden in the subsoil of Istanbul.

This massive, now-retired coal-mine excavator is said to resemble a mythical dragon.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

Climb down into the largest sinkhole in Qatar.

The rocky occasional overnight accommodations of a Connecticut folk legend.

Ancient rock-cut caves adorned with Buddhist inscriptions and sculptures.

This 470-meter-long dripstone cave was discovered by chance in 2006.

Local legends say that a giant who tried to destroy a nearby church lived in this rock cave.

A haunted slate mine turned concert hall and a hidden fairy garden.

For the deepest sleep of your life, head 1,375 feet underground in Wales.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

Under the desolate and windswept northern coast of Barbados stands a small oasis filled with sea anemones.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

A tunnel with windows, so you don't miss out on the impressive views.

This mysterious artificial cave has long puzzled New Englanders.

The San Marino-Rimini railroad was short-lived but this tunnel once provided shelter for hundreds of refugees during World War II.

At this gas station in the middle of the desert, a convenience store has been carved directly into the rock.

First road tunnel in England.

A tiny chapel and burial site lurk underground in Jajce.