The most elaborate of 12 medieval arched doorways to the old city of Burgos.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

Rebuilt remains of a temple to Roman god Mithras.

An unusual round church in London with a Templar past.

This baroque wonder is filled with a trove of artistic treasures.

King Ludwig I's collection of beautiful women.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

The famous artist couple lived and worked here, in two different houses separated by a bridge.

Beneath the city of Lourdes, France is a massive, concrete church.

The final resting place of the great navigator, or maybe his brother.

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

Iconic red and white plaques show the creative names invented to navigate the city streets.

The famous winding walk at Chartres is surrounded in mystery and myth.

His body was found mysteriously preserved in a Swedish mine over 40 years after his initial disappearance.

Commonly acknowledged as the only public monument to the Devil himself.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The most visited, and possibly most controversial, museum in Germany.

CDMX's home for the world's culinary delights.

A jewel of the Mexico city skyline now slowly crumbles after surviving an earthquake.

The stoutest tree in the world.

Stained glass windows bathe this botanical garden in cosmic light.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

A museum in the former home of Marxist revolutionary Leon Trotsky.

An indigenous take on European design creates a stunning visual overload.