The world's most active stratovolcano is almost always erupting.

Italian cave with exceptional acoustics and an unsavory history.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

Thousands of well-dressed mummies below a monastery.

Tourists to the mountaintop Sicilian town often overlook its ancient fortifications.

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

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

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.

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

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.