This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Monument to a suicide protesting the Soviet invasion.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Historic funicular railway, believed to be the shortest railroad in the world.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Hear the quietest sound from across the dome.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

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

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

France's most famous cemetery, with some of its most curious tombs.

Famously misunderstood wonder of the ancient world

The first declared National Monument in the United States.

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

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

Macabre astrological automaton clock dating to the late 1400s.

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