The longest continuous lava tube in Oregon.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A tourist attraction founded around a slumping cabin.

Canyon walls shrouded in ferns.

Concrete strongholds stand guard over the Golden Gate.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A fine mixture of the old and the new topped with an art deco neon spire.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Seat of the Duke and Duchess of Devonshire for centuries.

Eyam took steps to quarantine themselves and keep the plague from spreading.

This one-time health resort was used by aristocrats around the world.

A whimsical bridge adorned with decorative dragons.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.