Well-preserved, still-functional sliding wood doors from Ancient Rome can be found in this Vesuvius-stricken house.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

A sulfuric hellscape in southern Italy.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

Smack-dab in Campania’s volcanic fields, this scenic lake was once thought to be the gate of hell.

Virgil's many-mouthed gateway to the underworld.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

The remains of this medieval Roman road and lookout towers dot the rugged coastline of southern Lazio.

A Roman temple perched over an Italian town, forgotten several times over.

Along a manmade hexagonal lake lies what was once the main port of ancient Rome.

The final resting place of the poets Shelley and Keats.

Once the home of a renowned slaughterhouse, formerly working-class Testaccio is still the place to go for Roman offal dishes.

Avoid gangster interaction while window-shopping.

Finally, you don't have to be a pious Swedish seaman to relax like one.

New York City's smallest piece of private property.

Tucked away amidst some of the most famous addresses in the world is New York’s only fraction of a street.

There's something in the air as history repeats itself at this museum dedicated to the Swedish pop band.

The official meeting point for the oddly named governing assembly of ancient Sweden.

Ancient burial grounds of the wealthy.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

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

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

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

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