Secret refuge and museum of the Duke of Florence.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

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

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

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

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

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

This enigmatic artifact is a rare depiction of an ancient Iberian noblewoman.

These ancient artifacts are a testament to the enduring significance of the bull in Spanish culture.

This embalmed man is one of the best preserved mummies from the Canary Islands.

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

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

After the queen of Spain had a dream where these statues fell and crushed her, they were removed from the palace and given new homes around Madrid.

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

Automatons that were once removed after one fell from the building.

This little sun pays homage to a massive gate that once stood at this location.

Once a resting spot for King Fernando VII.

The remains of this misplaced church were moved here stone by stone.

The unfinished final resting place of some of Spain's most prominent politicians.

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