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

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

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

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

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

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

2300-year-old Roman road connecting the empire.

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

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

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

One of seven Jewish catacombs in Rome and one of only two open to the public.

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

A modern sliver of architecture in Roma.

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.

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

In one Chicago park, a trio of werewolves are waiting to devour their fallen brethren.

Pizza with a side of fine art.

A relic of the Cold War in Chicago.

Honoring Italian greats from Joe DiMaggio to Rocky Marciano.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

A military museum and library dedicated to the citizen soldier.

A Japanese temple, old German townhouses, and public chess tables offer a peaceful escape from the bustle of the North Side.