A church filled with the bones of hundreds of virgins martyrs—or so they say.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

A church of bones, decorated with 40,000 human skeletons.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This medieval church in Rome was almost destroyed following a terrorist attack in 1993.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

This hermitage celebrates the legend of Emperor Constantine's healing from leprosy.

This small church was constructed over the ruins of three temples dating to the Roman Republic.

A small cell adjacent to this church was once the bedroom for a renowned saint.

A rather vulgar example of the transition from Latin to the Italian vernacular.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This ancient Roman arch misled treasure hunters for centuries.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

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

Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

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

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.