Eight naturally mummified bodies in glass coffins are housed in an underground crypt.

Naturally preserved bodies are eerily staged throughout the crypt in varying poses.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

This artificial cave looks like something out of a fairytale.

A saintly relic hidden in a Prague church basement.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

A half-buried vehicle in Prague's is the latest iteration in a long-running piece by Czech artist David Černý.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

Two stunning 17th-century libraries and a cabinet of curiosities.

Giant wind turbine with observation deck at the very top.

Constructed by forced laborers, this submarine pen is now a museum and war memorial.

A tiny island is connected to the mainland by a private railway that residents travel in their own personal wagons.

Located in the middle of public park, this cave built in the early19th century houses an ancient stone sarcophagus.

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

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

This former Soviet military base has over 10 original aircraft and an enormous amount of memorabilia on display.

Natural time capsule containing an alien ecosystem.

The prototype for all Nazi concentration camps.

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

These "anatomical machines" are only one of the many strange items in this Italian crypt.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.