Elevated freight railway turned wildly successful urban park.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The only subterranean ping pong table in Atlanta.

Also known as the Founding Church of Scientology.

Located in Nairobi National Park, this animal orphanage is the oldest of its kind in Kenya.

A public urinal so pretty, it was declared a national monument.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.