A flamboyant five-story building in Bulgaria resembles a crawling snail.

This building has two facades of clashing architectural designs.

A decaying, yet still functioning, work of communist architecture.

An homage to the medieval rulers of Bulgaria.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

This stunning and ethereal mural symbolizes the beauty, unity, and diversity of humankind.

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

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

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

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

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

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

The Mexican painter Diego Rivera created this unusual museum to display his collection of pre-Hispanic artifacts.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

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.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

Frida Kahlo's childhood home, now a museum of her life and works.

Colonial architecture meets urban art in this sprawling open-air gallery.

An island graveyard with spectacular views of the Caribbean.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.