Not far from Madrid, a set of perfectly preserved trenches date back to the Spanish Civil War.

Just like in Hollywood, Madrid has also a forgotten walk of fame.

A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.

Artist Natividad Sánchez wrote a new ending for one of Roman mythology's tragic love stories.

This historic fountain is a favorite neighborhood meeting point.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

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

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

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

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Inside this church are the alleged remains of the patron saint of lovers, epileptics, and beekeepers.

Stockholm's narrowest alley is barely over two feet wide.

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

Dedicated to a young woman who broke gender barriers at the University of Madrid.

This giant sculpture made of trash is a critique of society's wastefulness.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

This house's itty bitty size means no humans allowed.

This Art Nouveau gate still stands at the former entrance of a 20th-century Spanish writer's colony.

A bronze statue of the fictional character nicknamed "Mrs. Hat" from a beloved Belgian comedy.

The remains of a convent turned military barrack in the heart of Madrid.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.