An isolated village literally built into the crevices and rock formations of a mountain.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

Turntable anonymously received orphans, alms, and groceries.

A beautiful but toxic fountain of mercury.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

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

The world's only museum devoted to the wonders of fluorescence.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

This abandoned sea fort has become an accidental bird sanctuary.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

This free, take-a-book shop seems like a trick but isn't.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

One of the last active volcanoes on the Eastern seaboard.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.