A black cat protests the City Guild in Riga's Old Town.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Anatomical cabinet holds unexpected treasures.

A lover's walk between hilltop towns, decorated with graffiti love notes.

The bomb-ravaged remains of of a colossal Neptune.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Five candy-colored villages on the Italian Riviera.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This demon atop the Notre-Dame de Paris looks utterly bored.

Claude Monet was baptized in this lavishly ornate Paris church.

The narrowest street in Paris.

This bridge was constructed from the rubble of the infamous Bastille.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

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

An abandoned train station in Munich constructed for the 1972 Olympic games.

A graveyard and memorial chapel for victims of leprosy.

This small Bavarian graveyard is filled with empty graves for German soldiers lost during the World Wars.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

A Nazi concentration camp and Anne Frank's place of death.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.