The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

No need to strap in for a "ride" on this walkable roller coaster.

Hidden in the forest are the crumbling, graffiti-covered remains of the factory where most of Germany's explosives were produced during World War II.

Built to transport German U-boats through the never-completed Masurian Canal, the locks near this Polish village are now home to a rope course.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

Inaccessible by foot, Japan's most secluded train station sits in the middle of nowhere.

Abandoned since 1998, this train station has become an oasis for urban explorers.

The remains of diamond fever taken over by the desert.

This coffee shop lies hidden beneath a historic church.

A hidden medieval crypt where a famous legend says the devil used to teach black magic.

A burial vault located under Tiber Island in the middle of the Italian capital.

The haunting cadaver tomb of a famous French poet, playwright, and filmmaker.

This 17th-century "unicorn" was cobbled together from the skull of a rhinoceros, the legs of a mammoth, and the horn of a narwhal.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Wander through the Corridor of Wonders in these stunning limestone caverns.