A long abandoned hospital building on the outskirts of NYC.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

This church in Pittsburgh is home to the largest collection of religious relics in North America.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

A wealth of local folk art, antiques, and curios, without ever leaving your car.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

Dr Barnes' $25 billion private collection of art and arboretum.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

Jule Körner's house full of bizarre architectural details.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

Beautiful Victorian buildings from L.A.'s forgotten architectural past.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

Bizarre Cavern.

This Detroit ruin was once a gothic bastion of its community, but now it stands as a haunting ruin.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

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

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

A living archive of urban activism and space reclaimed.

A Prada store in the West Texas desert that is never open for business.

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

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

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