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

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

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

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

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

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

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

A deep mark on the remains of a Roman temple, believed to be left by a legendary warrior.

A Byzantine-era church hidden in a wooded area below the Acropolis.

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

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

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

Plaques on its facade commemorate the Tiber's most destructive deluges.

This Roman relic was discovered in Scotland by a mudlarking ferryman.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

Even for Egyptian royalty, the afterlife was bring-your-own-beef.

This Romanesque church is built over the tomb of a martyr who legend says defeated a dragon.

This ancient Roman arch misled treasure hunters for centuries.

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

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

The stone sculpture of an Ottoman soldier is an homage to a lost Providence landmark.

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.