The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

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

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

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

This ancient market is often referred to as the oldest shopping mall in the world.

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

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

Ancient ruins hidden underneath a modern luxury hotel.

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

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

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

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

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

A modern sliver of architecture in Roma.

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

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

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

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