The highway's southernmost spot is a beloved local attraction.

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

This ancient theater was once the home of fierce gladiatorial battles.

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

Mexico's National Sound Library houses music, recordings, and voices from the nation's rich past.

These subterranean models show Mexico City's central square during three different eras.

An incredible collection of Mesoamerican art assembled by one of Mexico's great artists.

A Mexico City subway station boasts a hidden museum, complete with a working radio booth.

The ruins of a former sanctuary for elite Aztec warriors.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

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

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

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

These enigmatic columns tower over the ruins of an ancient Toltec city.

The stoutest tree in the world.

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

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

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

Dramatic river bend surrounds a natural red-rocked pedestal.