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

The highest point in Belgium is a staircase to nowhere.

A luxury hotel housed in a former 15th century Gothic church.

This historical Netherlands fortress still bears the marks of its single siege.

A ghost village sits atop a mountain within Jordan’s largest biosphere reserve.

A more chill but no less fascinating version of the famous ancient archeological site.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Two gravestones clasp hands over the religious divide.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

The only Frank Lloyd Wright-designed structure in the architect's hometown.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

Medieval irrigation channels built into the sides of mountains provided Valais with water for hundreds of years.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

The oldest working Brewery in Britain.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

Famously misunderstood wonder of the ancient world

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

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

Legends surround this jagged rock formation in the New Mexico desert.

Naturally formed rock city in Poland.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

The Arctic Archipelago is home to world's largest third order island: an island in a lake on an island in a lake on an island.

Come stay at a live-in art installation.