These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

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

An ancient Egyptian temple in the middle of Madrid, Spain.

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

A neighborhood represented by an apparent geocentric and flat-earth model of the Solar System is hidden in the subway of Madrid.

Built to power trains, the engines in this building provided the entire city of Madrid with electricity during 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.

This lucky bronze frog was gifted to Madrid by a casino.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

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

Strange masks and obscure costumes are housed in this old Madrid corrala.

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

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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

An automaton perched above an classic clock and watch store

A vault of safe-deposit boxes in an old bank has been repurposed as a time capsule of Hispanic culture.

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

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

The earliest known map to show America, discovered by accident at a Paris bookshop.

These distorting, funhouse mirrors achieved fame in a renowned piece of Spanish theater.

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

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

A plaque on the side of a building is a small tribute to the woman who invented an iconic Berlin fast food.