A modern reimagining of a medieval city gate.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

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

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.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This bridge was constructed from the rubble of the infamous Bastille.

The celebrated eyesore created by starry-eyed sweethearts.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

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

Visitors to this Belgium graveyard are greeted by the grieving stone parents of the young men lost to war.

A rare example of World War I trenches from the British front.

In the shadow of a former battleground, the resting place for nearly 2,000 soldiers who died in World War I.

This memorial museum chronicles the apocalyptic destruction of the First World War.

A moving memorial to the fallen and missing from WWI trenches.

Also known as Napoleon's Canal, this waterway was created on the orders of the general, and construction was interrupted by Waterloo.

This building's name and a plaque are all that's left of what was probably the most important nightclub of the Madchester music scene.

This cheese shop also houses a museum devoted to Dutch dairy.

Huge herds of Asian elephants can be seen walking, bathing, and just chilling at this Sri Lankan park.

The world's largest frame offers spectacular views of the city's past and present.

A very classy 1920s-era bar right in Grand Central Station.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.