Most famous work of one of Frank Lloyd Wright's sons.

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

Historic funicular railway, believed to be the shortest railroad in the world.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

This enormous World War II relic is one of the largest wooden structures in the world.

This unique sanctuary invites you to interact with the beautiful birds.

A UFO scrapyard in the California desert.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

A couple turned their front yard into an artistic masterpiece.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

The first permanent memorial to a unique secret weapon of World War II.

A 16th-century horror show built in a lovely Italian garden.

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

A beautiful opera house in the heart of Amazonia has recently restarted performances after a 90-year hiatus.

Resting place of Hollywood's immortals is also site of summer film screenings.

The largest historic preservation organization in the United States.

A sprawling nature preserve harbors the world's only living dragons.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

A crumbling hospital from the 1850s on Roosevelt Island.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Once America's longest-manned military fort, now an abandoned hulk.

A spiral staircase twists to the top of this unusual Czech lookout tower.