This historic, palatial theater is now one of the world’s most beautiful bookstores.

This black shoreline is made up of exploded lava particles.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Europe's second largest ossuary wasn't discovered until 2001.

This traditional garden in the San Fernando Valley doubled for Star Fleet Academy, and is irrigated entirely by wastewater.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

An optical illusion found amid a logged redwood forest.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This might just be the TARDIS of bookstores.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

One man's swirling six-acre monument of stone.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

Ancient paintings known as the "Sistine Chapel of Cave Art."

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

Florida castle built with aluminum printing plates.

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

The land is home to swimming ponies and a legendary 18th-century treasure.

Los Angeles's oldest cemetery allows visitors to trace the history of this proud city.

The liveliest ghost town in the state.