The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

Ample proof that watery ends make for well-preserved, millenia-old mummies.

Goethe's "Faust" was inspired by these rock formations known as the "Devil's Pulpit" and "Witches' Altar."

The great Danube river starts here.

This German bone house contains the remains of some 20,000 souls.

These 18th century gardens tell a rocky story of the son of Odysseus.

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 sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

A true Valhalla for cactus and succulent lovers.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

The only castle in North America to ever house European sovereigns.

Part bookstore, part café, and part forest.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Abandoned outpost once home to a murderous tyrant.

A strange house built only at night, with rumored mystic inspiration.

The rusting remains of the largest assembled WWII fleet on the West Coast.

A Frankenstein blend of science and art allows one tree to produce 40 different types of stone fruit.

Walk in the footsteps of the gods and straddle two tectonic plates.

The Icelandic Sea Monster Museum explores the area's history of aquatic cryptid sightings.