Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

The famous winding walk at Chartres is surrounded in mystery and myth.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

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 "Great 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.