These medieval skyscrapers dominate the skyline of this small Tuscan town.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

Romans built the world's tallest artificial waterfall in 271 BC.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

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

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

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

Pilgrimage site for star-crossed lovers.

Five candy-colored villages on the Italian Riviera.

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

Stalactites and stalagmites in a beautifully lit cave.

A hugely vast Irish landscape of barren rock that stretches for miles.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

The bright red stripes streaking across the rocks are the star feature at this Icelandic waterfall.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

An ancient octagonal weather station named for the eight Greek gods of wind.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This famous archeological mystery may be an ancient example of movable type.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

This remarkable cave was discovered after a shepherd watched bees enter and exit through a small fissure.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.