The first green space constructed on an elevated viaduct.

Statue of death tucked in the University of Medicine courtyard.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A subterranean shelter remains intact under a busy Paris railway station.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A mechanized clock where a man fights off a dragon, crab, and rooster.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

This sturdy, circular stronghold served as one of the forts that protected the Venetian Lagoon.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

Inside this mansion turned museum, the works of prominent Croatian artists are on full display.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

An ancient knight and a symbol of the city's freedom.

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

Longest fortress system anywhere in Europe.

Humble beginnings for one of the world's most famous scientists.

Gargoyle head that brings good luck.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

A wonderfully strange collection of 500+ stuffed frogs doing people things.