A lush indoor jungle fills this bustling Madrid transportation hub.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

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

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

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

Mexico's astounding mummy museum with "the world's smallest mummy."

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

The first public library in the Americas has more than 45,000 books dating back to the 15th century.

A close look at the church's walls reveals pieces of Mexico's history.

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

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

On a cornerstone of the City Museum is the head of a monstrous serpent stolen from an Aztec pyramid 400 years ago.

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

The famous artist couple lived and worked here, in two different houses separated by a bridge.

Part bookstore, part café, and part forest.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

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

This old-school café is famous for serving coffee, chilaquiles, and the Cuban Revolution.

An abandoned 1930s gas station turned bustling neighborhood park.

Don't bother sending any mail to this ghost town.

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

One incredible room in the Santa Barbara Courthouse is covered in wall-to-wall canvas murals.

Forever immortalized in concrete, this Simpsons etching was crafted by show creator Matt Groening.

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