High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Stalactites and stalagmites in a beautifully lit cave.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

Thousands of well-dressed mummies below a monastery.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Monasteries on rock pillars, once accessible only by frayed ropes.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A submerged archeological park still holds the wonders of a Roman Sodom.

Staves, storm-calling, and of course, necropants.

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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

An eerie, derelict amusement park in Berlin.

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

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

The fairy tale castle of the "fairy-tale king."

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

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

Peek through a transparent pyramid and drink in the mountain made of books.

A curious collection dedicated to human and animal anatomy and pathology.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

Strange secondhand shop showcasing taxidermy and oddies