These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

An abandoned asylum where patients have been forgotten but their possessions remain.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

This large midwestern cavern features impressive rock formations and an underground waterfall.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

Bad farming practices caused this unnatural natural wonder.

Graffiti, cars, and religion combine to create this jungle of scrap in the Nevada desert.

Even Henry David Thoreau found this glacial pothole irresistible.

Acres of natural wonders left behind by a socialite-turned-gardener.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

This bridge is haunted by the ghost of a distraught mother.

Abandoned concert venue legendary for its rock counterculture.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

Ruins of a Carnegie family mansion on Cumberland Island.

A hidden subterranean installation offers a view of the sky.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

A museum dedicated to exhibiting remarkable outsider art.