The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

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

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A floating cat sanctuary on an Amsterdam canal.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

This modest marker near Notre Dame identifies the very center of Paris.

César Baldaccini's iconic sculpture of a 40-foot thumb stands tall in La Défense.

The Lone Star plaque hangs in a bombed-out bunker in Normandy to honor a Texan colonel's heroic actions on D-Day.

Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

Surrounded by a verdant garden and a backdrop of ivy, a monument to beloved poet Khalil Gibran stands outside of the Lebanese embassy.

This 20-story artwork on a public housing block is the tallest mural in the Southern Hemisphere and tells the story of a community.

From the late 19th century until the 1960s, these stone-lined "stumps" were a popular place for people to air their views on local and international issues.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

This historic boathouse was constructed using salvaged lumber from burned barns.

The world’s first penitentiary, meant to be humane, drove men insane.

Washington D.C.'s most famous pianist, composer, and bandleader still tickles the ivories outside Howard Theater.