Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

2300-year-old Roman road connecting the empire.

A massive wintry wall of snow up to 66 feet tall flanks a highway through Japan's mountains.

Peace Park and the Atomic Bomb Dome.

This Japanese national treasure was originally built in 593.

The curious underground history of keeping Paris clean.

Water and windows define this defensive Italian well.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

A fairy tale castle in modern Rome.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Abandoned railway line circling the city of Paris.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

This massive library holds what was once the largest book collection in the world.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.