The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

An autonomous republic of Orthodox monks.

Two churches shoot bottle rockets at each others' bell towers in an unusual Easter celebration.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

A wunderkammer of mysterious objects and stories.

This classic restaurant features a gorgeous mirror-clad room.

A slice of central Asia in the middle of Berlin.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

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."

A taxidermied stork with an arrow through its neck proved that birds migrate.

The world's oldest rose is so tough it survived being bombed in World War II.

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

Go surfing on this urban wave, "hacked" by local surfers.

The patron saint of spinsters grasps a container of dried blood.

King Ludwig I's collection of beautiful women.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

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

Home to the "Rat King" of Nantes and other wonders of the natural world.

The curious underground history of keeping Paris clean.

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

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

Paris' linguistic guide to the international language of, yes, love.