Places mpudvar Wants to Go

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

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

An amusement park on the grounds of an unused nuclear power plant, with a swing ride inside the cooling tower.

This unique Renaissance castle was turned into a home for Nazi occultism.

An intricate and amazing house built by architect Karl Junker.

An eerie, derelict amusement park in Berlin.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

A meteorite-bounded town in Bavaria.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

A miniature Corsican village built out of pebbles.

Small French town or alien garage?

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

One woman's decades-long obsession with the "La Fée Verte."

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The curious underground history of keeping Paris clean.

The oldest stone house in Paris was built by its most famous alchemist.

This little-known relic crypt holds stolen parts of a Roman Empress.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.