Inside a busy metro station, an impressive mural depicts the prehispanic city of Tenochtitlán.

Psychedelic murals coat the inside of a nondescript research library.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

In 1909, the steepest and most difficult piece of track on the Canadian Pacific Railway was replaced with a series of spiralling tunnels cut into the mountains.

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

This cemetery features modernist statues as strange as its name.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A 16th-century horror show built in a lovely Italian garden.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

A stunning fountain depicting a mythological she-goat carved directly into the rocks on the grounds of a Renaissance palace.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

Seventeen members of the local royal family are interred in this Baroque church in northern Germany.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Water and windows define this defensive Italian well.

This retro underwater observation tower would make the perfect lair for a sea-loving villain.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A miniature village lies nearly forgotten in the forest by the side of a major highway.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

These 1,500-year-old remains were found in a mysterious Anglo-Saxon mass grave.

These magnificently sculpted tombs represent Spain's own legendary version of "Romeo and Juliet."

This fantastical house shaped like a seashell brings aquatic design to architecture.

Everything in this miniature world was handmade from matches, paperclips, wires, tin cans, and other everyday objects.