The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Ship-sized kinetic sculptural fantasy.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

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

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Five candy-colored villages on the Italian Riviera.

Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The middle finger of modernity.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

A diverse collection of wax, bone, papier-maché and mummified relics.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

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

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

An old department store turned Nazi prison turned artist commune.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".