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

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

Holding the current title of "biggest chair in the world," it stands with little fanfare in Lucena, Spain.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

Swedish skyscraper with a 90° twist.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

An impressive home made of stone, carved more than a century ago.

The place to be if you love vintage Swedish cars.

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

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.