This historic electric train has operated with regularity since the early 1900s.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

A Spanish town built into the cliffs.

The world's largest wooden structure.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

For more than a century, Parisians have come for affordable dishes in a grand converted train station.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

This abandoned Belgian fortress is purposefully being left to nature.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

An enormous collection of cars, figurines, signs, puppets, strollers and other collectibles.

A pair of giant stone heads represent the ancient Roman saints beheaded here.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

France's high-tech, future-themed amusement park.

Guests can stay at a hotel in the former French abbey where lie the tombs of King Henry II and King Richard the Lionheart.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

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

Exquisite examples prehistoric bas-relief carvings.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.