A miniature train-ride through Slovenia's largest cave system.

The seat of the Mantua bishop holds many secrets within its walls.

A gorgeous example of 13th-century Gothic architecture.

These elaborate gothic monuments honor Verona's medieval lords.

This medieval castle was reconstructed by Carlo Scarpa.

One of the tallest bell towers in Italy plays a particular melody at just two times each day.

Go inside to really appreciate this 500-year-old technological masterpiece.

Two stone columns flank the grand Venice square, but there were supposed to be three.

A twisted steel beam from the wreckage of the World Trade Center is the centerpiece of this memorial for those who died on September 11, 2001.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

One of the largest squares in Europe contains an entire artificial island.

The oldest botanical garden in the world that technically isn't the oldest.

The walls and streets of the ancient city are peppered with penises.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

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

This entire town moved to a safe location after it was devastated by an earthquake, but the remains of the original town are still around.

Leveled by an earthquake, this Italian village is now preserved as a massive concrete art project.

This amazingly preserved Doric temple was abandoned before it was ever completed.

A lesser-known World Heritage Site with an amazing Byzantine style mosaic of Jesus on the semi-dome of the apse

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

Italian cave with exceptional acoustics and an unsavory history.