A 12th-century fortress containing some of Berlin's oldest buildings.

Hot springs monkey spa in the middle of Hell's Valley.

This home of a taxidermy hoarder is among the grandest and most singular of historic English estates.

Social outcasts and cannibalism in Stalin's Soviet Union.

A uniquely authentic display of traditional Russian culture.

This Russian museum stresses the importance of keeping clean and even holds one of Pavlov's dogs.

No one knows why ancient labyrinths were built on this tiny northern island.

Some of the world's only freshwater seals live in one very special lake in Russia.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

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

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A crumbling hospital from the 1850s on Roosevelt Island.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

An impactful museum ensures notorious war crimes disguised as "medical experimentation" won't soon be forgotten.

Fascinating early attempt at a Jewish autonomous settlement.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

In which a local geological marvel becomes a quaint roadside attraction.

The first of Lancaster's "rural cemeteries."