This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

This is the oldest Roman-made bridge in the city still existing in its original state.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

The mystic whose incorrupt corpse still attracts the faithful.

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

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

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

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

A hospital where antique dolls are given new life.

A Nesting Doll of Churches.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

Architectural monsters are devouring this palace's every door and window.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Rome’s legendary peephole vista is also a former Crusader stronghold.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A statue honors the children who fought Nazis in Poland.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.