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.

The disputed geographic center, or "navel," of Italy.

The ruins of this Roman temple dominate the small city in southern Lazio.

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

Τhis feline monument commemorates fallen soldiers on a field that saw many, many battles.

This statue is the only female representation of Rome's "talking statues."

A massive marble foot is tucked away in a small alley near the Pantheon.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This medieval city gate is now a blend of the past and the modern world.

These ruins once flourished as the capital of the Lydian kingdom, often credited with the invention of metal coinage.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Only open for two days a year, this church links ancient Greek and modern Christian celebrations.