A wall of chewing gum moonlights as collective art.

Its 27 graveyards represent the many nationalities and ethnic groups that voyaged to this wilderness in the late 19th century.

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.

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

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

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

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

The singular ruins of a mysterious lost city.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

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

This enormous censer uses a pulley system installed over 400 years ago.

Originally planted by the ancient Carthaginians, this sprawling palm grove is one of the largest in the world.

Iconic red and white plaques show the creative names invented to navigate the city streets.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

An enormous, inside-out glass globe built in 1935.

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

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

This remarkable museum sprung from one of the most important prehistoric archaeological sites in the world.

Five million people are laid to rest here, more than the population of Madrid itself.