The most complete statue of this Aztec god sits a top a throne carved with images of hallucinogenic plants.

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

A striking depiction of Teotihuacan's mysterious "Spider Woman."

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

Famously misunderstood wonder of the ancient world

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

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

The oldest operating pharmacy in the world features 800-year-old recipes.

The middle finger of modernity.

The only castle in North America to ever house European sovereigns.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

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

Giant topiary dog once played a role in a terrorist bomb plot.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

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.

Spain's stunning solar energy plant.

A Spanish artist builds his own castle.

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

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

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.