An eerie, derelict amusement park in Berlin.

The fairy tale castle of the "fairy-tale king."

This crumbling Art Deco movie palace in Mexico City has been abandoned for two decades.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

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

The famous artist couple lived and worked here, in two different houses separated by a bridge.

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

Diego Rivera's massive tiled fountain and failed infrastructure project.

Twelve natural mummies are displayed in the crypt of this former monastery school.

A church dedicated to the Mexican skeleton saint.

66,000 pieces of art, donated by one of the world's richest men.

Part bookstore, part café, and part forest.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

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

A historic Georgian building and warm springs.

A miniature village mimics the surrounding buildings so well it includes itself.

The first archaeological site discovered by aerial photography.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Eighty million natural history specimens call this gargantuan museum home.

Catacombs turned marketplace.