A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

Inside this library, the history of Los Angeles is retold through a mural.

Though the original building has been demolished, these massive bronze doors were saved.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

An iconic location along the Los Angeles River where countless movie scenes are filmed.

Outposts of this restaurant chain were shaped like jaunty chapeaus.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

The beautiful 1920 Pantages Theatre remains hidden just underneath the LA Downtown Jewelry Exchange.

The final resting place of a space program monolith, soon to be unveiled again to the public.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

This coffee shop lies hidden beneath a historic church.

Once home to more than 50 displays of freshwater fish.

A roadway designed for a visiting monarch.

The fifth-longest natural arch in the world, and the longest outside China.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Along a California highway is a kind of Jurassic Park made of metal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

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

Stroll through a wonderland of stupendous moss-covered trees.

Odd outsider art installations surround a Gold Rush-era ghost town.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.