A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

According to legend, this small island was home to one of the sirens met by Ulysses in the Odyssey.

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

Beautiful views and Roman-style statues on the Italian coast.

This clifftop arch is a natural stunner.

Before the more famous Royal Palace of Caserta, the king of Naples first commissioned this overlooked residence.

Pompeii's less famous neighbor is still revealing her secrets.

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

According to the legend, this structure was built in a single night with the help of the devil.

This tiny islet has somehow housed an ancient temple, two monasteries, a church, a fortress, and a restaurant.

This small chapel built into rock is the oldest place of worship in Luxembourg.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.

This educational institution and reference library specialize in the psychic arts and mediumship.