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

A towering monument in Spain has proven to be more labor-intensive than initially planned.

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

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

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

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

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

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

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

An automaton perched above an classic clock and watch store

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

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

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

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

A gated cross stands on the site where an Irish revolutionary met his end.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A rare example of a medieval house in Rome adorned with a melancholic inscription.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This ancient market is often referred to as the oldest shopping mall in the world.