A lush indoor jungle fills this bustling Madrid transportation hub.

This stucco building in North Africa was the first American-owned property on foreign soil.

The tomb of one of the greatest travelers in history.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Touching this little fossil embedded in the wall of a grand mosque-cathedral may make your wishes come true.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

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

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

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

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

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

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

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

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

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

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

This sculpture pays homage to the street sweepers of Madrid since its inauguration in 2001 in Plaza Jacinto Benavente.

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

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

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

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

On an idyllic island off the coast of Sierra Leone, remnants of the defense of the slave trade and its later abolition.