The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

A winding, cliffside stretch of road overlooking the Delaware River.

A stretch of land where the sour-sweet vegetable is cloaked in darkness and grows so fast you can hear it crack, squeak, and pop.

A 12,000-year-old bog boasting rare plants and fauna.

Scene of the grisly murder of two Norwegian women in 1873.

Stumps of an Ice Age forest, visible only at low tide.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

Even Henry David Thoreau found this glacial pothole irresistible.

The loneliest island in New York.

The Vatican of the movie industry turned into an actual church.

The first and only carousel with a lineup entirely of insects.

An eccentric playboy's astounding natural history collection.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

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

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

The sunken structure looks like the victim of a catastrophic flood.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Records of the dead describe the myriad odd ways people used to die.

One of the deadliest American air disasters is nearly forgotten in Brooklyn.

Where one of Greenpoint's "five black arts" was practiced.

Underground vaults of a former brewery beneath Brooklyn's Crown Heights are now used to ripen cheese.

This California tree is the single source of the state's entire orange industry.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.