It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

This Stockholm light tower can be controlled by anyone with a smartphone.

It houses the remains of a 17th-century version of the Titanic.

The prototype for all Nazi concentration camps.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

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

The celebrated eyesore created by starry-eyed sweethearts.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This museum houses an imposing skeleton army comprised of creatures great and small.

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

Famously misunderstood wonder of the ancient world

This modest relic, with rich history as a strategic fort through multiple eras.

The oldest working mechanical clock in the world.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The taxidermied remains of a once-great parrot.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The monster at the center of the Darwin Center Spirit Collection.