The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

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

This one-window stand has been home to a giant vat of slowly simmering meats and an array of unique tacos for almost 50 years.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

The oldest continuously operating fish market in the United States.

Home to items never before seen by the public.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

This botanical garden boasts sculptures, industrial ruins, and an endorsement from the Dalai Lama.

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

The now-public home of a renowned art collector is full of unique pieces from viceregal and 19th-century Mexico.

A small building that loosely resembles a tooth is appropriately used as a dentist office.

Some charming, but sadly, unloved animal statues call this park home.

This tiny garden was built specifically to provide a place of peace and serenity away from the busy city streets.

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

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

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

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

In 2008, this Mexico City metro station was the site of an hours-long fight between emo, punk, and goth groups.

This "City of Books" holds a museum, library, and the complete personal book collections of five of Mexico's greatest thinkers.

A fabulously bizarre surrealist sculpture by the late artist Leonora Carrington.

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