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

This ancient Roman arch misled treasure hunters for centuries.

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

This curious, round temple is the oldest still-standing marble building in Rome.

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

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

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

This large, circular tomb is the final resting place of the first emperor of Rome.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

A collection of objects supposedly singed by the hands of souls in purgatory.