This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

This lucky bronze frog was gifted to Madrid by a casino.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.

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

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

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

After the queen of Spain had a dream where these statues fell and crushed her, they were removed from the palace and given new homes around Madrid.

Seaside ruins of a settlement that date back to the first century B.C.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

A former squatter's paradise outside Prague.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

An existential riddle in the world's largest ancient castle.

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

The statue of a cursed knight is said to come to life every 100 years.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A crucified and bearded female saint.

Countless grotesque faces stare out from this eerie Prague art wall.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

A surreal statue honoring Prague's favorite literary son.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Macabre astrological automaton clock dating to the late 1400s.