Amsterdam's Red Light District leaves little to the imagination.

An interactive museum dedicated to preserving and sharing the history of the home computer.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

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

This unusual elevator doesn’t stop or slow down.

A floating cat sanctuary on an Amsterdam canal.

An astounding annual light display honors the victims of one of Japan's most devastating earthquakes.

When this clock strikes a certain time, puppets showcase a story of life in Edo Japan.

Indents in the pavement are all that remain from a grisly death machine in Paris.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

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

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

This banal Parisian entranceway is not what it seems.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

A hotly contested micro-nation off the coast of Montserrat.

The first location of the eventual video game giant.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

A beautiful work of art designed to impress the Allied Forces.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.