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

The first museum in the world devoted to sexual gadgetry.

This artificial cave looks like something out of a fairytale.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Macabre astrological automaton clock dating to the late 1400s.

This cannonball has been lodged in the church wall since a 1695 bombardment destroyed the city center.

A little sculpture with a large wardrobe.

This modern arts center is built around a gem of late-Baroque architecture.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A piece of stonework relief commemorates the site where the Devil's rage, and odd apparel, destroyed a house.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Climb inside an iron crystal magnified 165 billion times its normal size.

A gift from Emperor Franz Joseph I to his wife.

The first modernist church in Europe.

A monument dedicated to a lone, brave invader.

A set of outdoor stairs named in honor of a famous Austrian artist.

This museum is dedicated to the little known ancient Roman history of Vienna.

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

The solemn exterior conceals an opulent interior of this 17th century church.

An exquisite Baroque church in Vienna's old town.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.