When this funny little building went up in the 19th century, most people thought it would simply fall over.

The titular "little arch" near this Italian resort is one of the most popular diving spots in the country.

An unsettling painting of three faceless sisters that is surrounded by history and legend.

Mysterious tombstones thought to be remnants of Atlantis.

One of the highest emergency huts in the world has been waiting almost a century to give imperiled climbers a place to lie down.

Windblown rock formations in an ancient Roman quarry.

This ultra-modern burial building would have stacked the dead like a giant filing cabinet.

Ancient cave tombs known as the "houses of fairies."

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

Europe’s oldest natural human mummy.

The mummified relic of St. Antoninus.

"The prettiest love letters in the world" ... or so said Lord Byron.

An Italian geologic wonder that served as the inspiration for the landscape of Dante's hell.

A sulfuric hellscape in southern Italy.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Italian cave with exceptional acoustics and an unsavory history.

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

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

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

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

Ancient snack bar of the Roman Empire re-opened.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

One of the largest caves in the world open to the public.