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

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

These museum grounds are a Dalai Lama-declared peace oasis.

This statue intended for children to enjoy became a minor political spat.

The official Presidential Residence of Los Pinos became an emblem of Mexico's opulence and presidential corruption.

A place to learn about the history and culture of Mexico's largest Anabaptist group.

A 19th-century Baja cantina that many say is the birthplace of the margarita.

The outdoor area of this contemporary art museum in Mexico is a modernist reinterpretation of hacienda architecture.

This monumental fountain has moved around the city multiple times.

The walls and streets of the ancient city are peppered with penises.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

The only museum with its curator—and her pets—buried inside.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Sip cherry liqueur at a bar dating back to 1840.

Eat the ultimate iteration of Portugal's most beloved pastry.

A never-finished memorial to the heroes of the Napoleonic War has become "Scotland's Folly."

Its sunny hues are believed to have inspired the town's color palette.

A mysterious, ancient collection of pre-Hispanic petroglyphs hidden deep in the Mexican desert.

The stoutest tree in the world.

This beautifully deceptive waterfall is something far different from what it appears to be.