Conflicting markers on its floor tell a tale of two city centers in San Antonio.

Memorial to the victims of the Holocaust in Serbia.

A retro Yugoslav congress, cultural, and business hall built in the 1970s, with an iconic world clock.

Two buildings named after their windows that make it look like a sea of television sets plastered to a wall.

This statue of a 15th-century Hungarian military and political figure has become known for its resemblance to a particular cartoon knight.

Considered an architectural abomination by some, this metal-clad building is known as 'little red riding hood' by locals.

One of Serbia's oldest luxury hotels and a nostalgic echo to Yugoslavia in the state's former capital.

Arguably Belgrade's only example of pure Art Deco architecture.

Ruins of a 10th century church tucked away deep in a botanical garden.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

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

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

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

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

Different sections of the Zemun Fortress were built in the 14th and 15th century as a response to the advance of the Ottoman Empire.

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

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

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

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

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

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

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

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.