A marvel of Byzantine engineering under the streets of Istanbul.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

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

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

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

A sculpture serving as an homage to Pope John Paul II.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The former home of an Italian artist is now a shrine to his ambitious works.

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

A huge enchanting public park just outside the ancient walls of Rome.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

Gods clash with machines in a power plant regenerated as a museum.

A modern sliver of architecture in Roma.

An abandoned Roman salami factory has found new life as an art space home to 200 squatters.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

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

An alchemist's "magic door" stands in the middle of a Roman park.