Stained glass windows bathe this botanical garden in cosmic light.

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

The singular ruins of a mysterious lost city.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

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

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

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

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Mexico City's largest market contains a Willy Wonka-esque wonderland.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

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

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

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

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

Extraordinary sculpture garden created by an eccentric English poet.

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

1800 rooms of single-family residence in Brunei.

Ferdinand Magellan dubbed the world's largest water village the "Venice of the East."

A symbol of Islam in oil-rich Brunei.

A remarkable feat of Victorian engineering across the Firth of Forth.

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

A six-ton wedding present for the King of the Scots.

Scotland's oldest medieval bridge is also among the last reminders of early medieval Aberdeen.

The heart of a Scottish legend had a centuries-long journey before reaching its final resting place.