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

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

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

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

One of the world’s most colorful cemeteries, where each pigment is symbolic.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Balanced on four stone pillars, this historic tower was the site of a tragic political assassination.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

Iconic red and white plaques show the creative names invented to navigate the city streets.

Giant kites are flown during this Day of the Dead celebration in Guatemala.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

Inside a busy metro station, an impressive mural depicts the prehispanic city of Tenochtitlán.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

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

This ancient jade mask depicting the Zapotec bat god was found in the ruins of the pyramids of Monte Alban.

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

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

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

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

A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

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

This modernist tower was saved by a fraternity with a 500-year-old penchant for shooting at wooden parrots.

Old Danish castle immortalized in Shakespeare's Hamlet.