Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

Yup, that's a 330-foot yacht passing over the highway.

A luxury hotel housed in a former 15th century Gothic church.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

A miniature city, once ruled by the Queen of the Netherlands.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Incredible labyrinth of man made caves.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

As the highest point in the Mid-Atlantic range this stratovolcano offers spectacular views.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This Roman arena once played host to bloody gladiatorial battles.

Marvel at this immense work of art that greets arrivals to the city.

Giant topiary dog once played a role in a terrorist bomb plot.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Every spring, locals see the shadowy figures of a ghost army of slain Greek soldiers descend upon this ruined fort.