A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

The Tudor-style cottage in the middle of the square is not quite what it seems.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

The celebrated eyesore created by starry-eyed sweethearts.

The site where two doves fell in love.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

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

A unrivaled and rather horrifying collection of wax dermatological models.

How did a French journalist’s grave become the sexiest statue in the cemetery?

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

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

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

Christ's blood preserved in a Belgian town.

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

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

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

Mosaics, storks, and brothels—this ancient city has it all.

A hidden three-foot-wide house separates these two regal churches.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.