A small "palace" and museum made of, and devoted entirely, to salt.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

Two massive and unstable sinkholes are yearning to unite, and their consummation could be catastrophic.

Elephant seals and sea lions have turned the abandoned buildings on this island into their endangered love shack.

A New England-style lighthouse along California's beautiful Highway 1 gets a re-do.

The southernmost outpost of the Russian Empire in colonial America.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

This whimsical seashell-shaped place of worship was designed to blend into its surroundings.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

A desert island with both a buried treasure and a famous castaway.

Amelia Earhart's possible place of death.

The ruins of a lighthouse on the island Amelia Earhart never reached.

The world's largest aggregation of great white sharks is at a mysterious spot in the middle of the ocean.

This airstrip atoll is uninhabited by humans, but absolutely full of birds.

A Japanese pilot crash-landed on this Hawaiian island after the Pearl Harbor attack and terrorized locals for a week.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

Submerged lava formations create incredible waterworks.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

This blowhole is supposedly caused by a trapped monster.

This former luxury resort in Kaua'i is now an abandoned relic.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

Race through the maze, get your name on the sign.