The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

Virgil's many-mouthed gateway to the underworld.

A tree that defies gravity grows in an ancient ruin.

The underground sanctuary of a mysterious ancient Roman religious cult contains an exquisite traditional fresco.

Unscathed for almost 2,000 years, the best preserved Roman triumphal arch is in a small southern Italian city.

A small thermal park among the mountains of Southern Italy features a surprising piece of modern art.

This scenic fortress dates back at least 2,400 years to the time of Magna Graecia.

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

Two of the few remaining life-sized Greek bronzes were submerged in the sea for over 2,000 years.

Thousands of well-dressed mummies below a monastery.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

Greenery covers the face of a gently-dripping waterfall deep in the mountains of central Sardinia.

This elaborate hole in the ground was built as a sacred site for an ancient civilization.

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

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

A young Italian couple has been locked in an embrace for over 6,000 years.

A medieval tower with a suspended iron cage used as an open-air jail for criminals who were exposed as a warning.

It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

Featuring the last fully walkable parapet walkway in Europe.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

These caves are home to a small church and were used to age cheese.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This massive subterranean fissure is known as the "underground Grand Canyon."