Known as the Royal Palace of the Euganean Hills, this often overlooked castle has been home for multiple noble families over the centuries.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

The Emperor Tiberius' palace of debauchery.

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

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

A huge enchanting public park just outside the ancient walls of Rome.

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

Although their purpose is unknown, these ancient Roman supporting arches showcase Hellenistic ingenuity.

A Roman calendar dating to the first century is tucked away in a small town alley.

The city of Palestrina was built around this magnificent terraced sanctuary dedicated to the pagan goddess Fortuna.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

Statue of a decomposing prince that once held his heart in its hand.

The deserted pirate-themed restaurant still entices explorers.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

A chapel on a volcanic core, marking the end of a successful journey.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

The famous winding walk at Chartres is surrounded in mystery and myth.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

Hundreds of hidden passageways weave through the old quarters of Lyon.

A modern-day Lascaux cave underneath Paris.