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

Beneath the most controversial monument in Mexico City is a cultural center that exhibits only digital art.

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

Psychedelic murals coat the inside of a nondescript research library.

Get a privileged view over Mexico City's Historic Center from a terrace right in its heart.

An indigenous take on European design creates a stunning visual overload.

The singular ruins of a mysterious lost city.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

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

Every equinox this Maya pyramid puts on a spooky ancient light show.

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

The archeological ruins of the ancient fortified city of the mysterious Teotenanca civilization.

Was the twisted roof on this church's belltower an intentional design or a happy accident?

This plaza is home to a number of works, including Montpellier‘s own Arc de Triomphe.

This small island, a byproduct of 19th-century canal construction, is now home to a charming Japanese garden.

Built in 1347, this belfry is one of the oldest in the world and survived intense bombing during World War I.

In France, a medieval-style home pays homage to an intrepid explorer who discovered Québec.

This mosque was based on Sub-Saharan Islamic architecture and created for the Senegalese Tirailleurs.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

A glamorous hotel that once accommodated French resistance fighters and concentration camp survivors.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

The shape of this old salt factory complex was inspired by the course of the Sun.

This remarkable checkered church on a Corsican hilltop is fabled to have been built by angels.