Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

A forgotten "city of water" underneath the famous Trevi district.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

The ruins of this ancient fortification wall sit in the middle of a quiet, residential intersection.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

Underneath one of the region's most historic roads lies the home of Plato's successor.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

A 16th-century horror show built in a lovely Italian garden.

This seaside sanctuary was once one of the most important religious sites for women in ancient Greece.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The ruins of an ancient fortification wall sit in front of and underneath this boutique hotel.

A Roman temple perched over an Italian town, forgotten several times over.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

Time has been frozen at this station since the bombing in 1980—or so it was believed.

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

The ruins of an early-18th-century complex that could once house up to 12,000 horses.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

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

According to the legend, this structure was built in a single night with the help of the devil.

Only three columns survive from this ancient temple in the town of Cori.