In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

The mummified relic of St. Catherine sits forever on a golden throne.

An amazing collection of wax anatomical models and terratological models.

An extraordinary collection of 18th century anatomical waxworks.

Buddha shrines hide within dark tunnels at this unique forest temple.

The oldest operating pharmacy in the world features 800-year-old recipes.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

This cemetery features modernist statues as strange as its name.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

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

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

A series of playful yellow penguins share a serious message about the environment.