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

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

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

A church dedicated to the Mexican skeleton saint.

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

Though the name might suggest otherwise, this is an American cemetery.

Legend says the building's unusual features were added at the request of a paranoid president.

A gigantic, symbolic artwork covers the side of the building.

The collection of intricate sculptures includes one carved from a mammoth's tusk

An eerie and beautiful group of columns mark the site of a grand mansion lost to time and fire.

A tunnel with windows, so you don't miss out on the impressive views.

A Prada store in the West Texas desert that is never open for business.

This rustic old building is said to be the most photographed barn in America.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A giant Troll lurks under one of Seattle's oldest bridges.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This North Carolina museum is keeping the pinball craze alive, with a little Space Invaders on the side.

Carrying on the legacy of a short-lived experimental school tucked away in the mountains of North Carolina.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The private clubhouse for the members of the Academy of Magical Arts.