The facade of this 16th-century building is decorated with carvings of 300 seashells.

A huge Megalithic chamber tomb located behind a cafe.

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

The "Prussian Versailles" that is as glorious today as when it was built.

The oldest stone house in Paris was built by its most famous alchemist.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

The narrowest street in Paris.

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

This demon atop the Notre-Dame de Paris looks utterly bored.

The "Paris of the Prairies" wouldn't be complete without a replica of the iconic landmark.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

Model Trains and Much More in Hamburg.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

A small stone boy mischievously turns his backside toward the city’s most famous water carrier.

Hamburgers are intensely proud of their tunnel beneath the river.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

A Nazi concentration camp and Anne Frank's place of death.

Striking occult iconography on a medieval German church.

This gateway to subterranean Hanover plays jazz, pop and rock to surprised passersby.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.