A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The oldest operating pharmacy in the world features 800-year-old recipes.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

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

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

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

An enigmatic modern marker left next to a historic Roman site.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

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

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

Ancient ruins hidden underneath a modern luxury hotel.

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

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

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

An unremarkable wooden wheel built into the side of one of Rome's oldest hospitals was part of a policy to reduce infant exposure.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

This softball diamond has a culture all its own.

This church was transported brick by brick from the ruins of a 16th-century city into Panama City's current historic district.

From a distance, Latin America's first Baha'i Temple looks like an enormous egg perched atop a hill.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

Giant topiary dog once played a role in a terrorist bomb plot.

Marvel at this immense work of art that greets arrivals to the city.