The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

A Stockholm metro station is home to an escalator that is not only the longest in Sweden, but among the longest in the world.

Stockholm's narrowest alley is barely over two feet wide.

Stockholm's deepest subway station is also a stunning ecological wonder.

The library's graceful rotunda is like a bibliophile's temple.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

It's believed this golden brick is part of the legendary lost Aztec treasure.

A grand entrance to one of the world's smallest Chinatowns.

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

Diego Rivera hid various people and symbols in his first large-scale mural project.

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

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

66,000 pieces of art, donated by one of the world's richest men.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Part bookstore, part café, and part forest.

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

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

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

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

This pre-Hispanic apartment complex also includes ancestral paintings that point to its military past.

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."

Cool down and fill up after visiting Teotihuacán at this bar and restaurant in a deep, underground cave.