The narrowest street in Paris.

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

This museum is home to one of the biggest collections of printing press technology—plus a river view.

A memorial to a dog that inspired rioting in the streets of London.

Ship-sized kinetic sculptural fantasy.

The only bicycle museum in the Netherlands charts the invention of the now-ubiquitous two-wheeled machine.

The Habsburgs' royal collections of art and wonders.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

This artificial cave looks like something out of a fairytale.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

An eerie, derelict amusement park in Berlin.

The video game-themed street art first popped up in the French city.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

A tiny, heartwarming piece of art hiding in plain sight.

The final resting place of one of the most important figures in the world of tea.

An icon of the Battle of Britain is frozen in flight in a grand Victorian museum.

Three large boulders covered in mysterious carvings and graffiti.

In 2008, this Mexico City metro station was the site of an hours-long fight between emo, punk, and goth groups.

Mexico City decorates its facades with extravagant floral arrangements every year.