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

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

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

A technicolor place of worship for Elevationists.

Monasteries on rock pillars, once accessible only by frayed ropes.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

A naturally beautiful, seemingly bottomless deep blue spring.

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

Built on a medieval synagogue, this church has a burial crypt, tunnel system, and Jewish ritual bath hiding deep underneath.

Italian cave with exceptional acoustics and an unsavory history.

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

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

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Thousands of well-dressed mummies below a monastery.

This clifftop arch is a natural stunner.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

According to legend, this small island was home to one of the sirens met by Ulysses in the Odyssey.

This church carved into the rocks is full of enchanting stone statues.

It's believed that these columns marked the end of the Via Appia.

The ruins of this medieval castle now stand as a monument against all wars.

The abandoned ruins of a failed resort hide on this verdant, picture-perfect island.

The tallest statue in Italy is also one of the world's tallest statues of Jesus.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.