This museum is dedicated to the little known ancient Roman history of Vienna.

The house that took a plunge into the facade of a museum.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The topiary maze at the Habsburg hunting lodge.

A spherical "micro-nation" in the heart of Vienna.

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

Visiting this café is like visiting the Austrian grandma you wish you had.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

A statue representing a lost Roman profession that was vandalized for centuries.

According to local folklore, this Roman sepulcher was once a throne for the Devil.

Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

A rather vulgar example of the transition from Latin to the Italian vernacular.

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

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

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

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

This ancient Roman arch misled treasure hunters for centuries.

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

Its interior is adorned with some of the best examples of early Christian mosaics.

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

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

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

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