This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A 16th-century horror show built in a lovely Italian garden.

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

The first (but not only) upside-down house in Germany.

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

The many—66 to be exact—faces of the German forest.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

This Rococo church is known as the most beautiful village church in the world, and does not disappoint.

The resting place of 18th century German mummies.

A Nazi concentration camp and Anne Frank's place of death.

Twisted buildings adorn the banks of the Rhine river.

Thousands of flowers create enchanting pink tunnels over the city streets.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

In 1830, cemetery workers in Cham unearthed a chamber housing thousands of skeletal remains from the 13th century, which can still be viewed today.

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.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

This museum tells the story of lake dwellers from 4000 BC to 850 BC, replete with stilt houses and goats.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

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

What was once thought to be a wellspring of unicorn bones is actually just a prehistoric burial site.

The prototype for all Nazi concentration camps.