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

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

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

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

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

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

A statue representing a lost Roman profession that was vandalized for centuries.

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

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

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

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

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

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

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

The remains of this medieval Roman road and lookout towers dot the rugged coastline of southern Lazio.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

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

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

A 1975 bylaw prohibits the construction of any building that would block the view of this Gothic Revival church.

Its interior is adorned with some of the best examples of early Christian mosaics.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

This simple frog painting created by musician Daniel Johnston embodies the spirit of Austin.

A serene temple with stunning stained glass hides in downtown Dallas.

A little stop along the Texas highway where Rock Hudson, Elizabeth Taylor, and James Dean stayed while shooting the 1955 film "Giant."