This museum houses two of Mexico's most impressive Aztec monoliths.

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.

This clock was gifted to Mexico as a show of gratitude for its long history of welcoming Arab migrants.

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

In Chapultepec Park there is a pavilion gifted to Mexico from South Korea to honor the 1968 Summer Olympics.

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

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

A museum in the former home of Marxist revolutionary Leon Trotsky.

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

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

The ruins of the bathhouse used by the ill-fated last Aztec emperor still lie in Chapultepec Park.

The lasting remains of the region's once booming cement industry.

A small Richmond island dotted with the remnants of hundreds of years of history.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

The greatest amusement park in the world is wall-to-wall farting dogs, puking rats, and cows with exposed breasts for the whole family.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

The world's first combination ski slope and power plant.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

This Denmark theme park is part family attraction, part experimental archaeology project.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.