This millstone commemorates a gruesome tale that may have been the source of the city's name.

This private home is famous for appearing in the cult-classic "Twin Peaks" series.

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Lucerne's central prison was converted into a tourist hotel with a bare minimum of changes.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This site was once home to Henry VIII and Elizabeth I.

From battleships to Roman vessels, this museum explores the depths of shipwrecks in the region.

A huge cathedral single-handedly constructed by one eccentric monk.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

The water of this well in Toledo lost its sweetness after the death of a young love.

At least according to the Guinness World Records.

A haven for book enthusiasts across the street from Retiro Park.

A lush indoor jungle fills this bustling Madrid transportation hub.

A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

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

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This piece of early engineering is rather unknown despite its location in the heart of Madrid.

The Spanish king's private bathroom embraced the idea of a porcelain throne.

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

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A statue commemorating a beloved stray dog who was adopted by the entire neighborhood where he lived.

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