This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

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

Arlington Cemetery exhibit dedicated to death and grieving.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Home to items never before seen by the public.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The wooded estate of the Forest Service employee responsible for D.C.’s cherry blossom trees.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

The remains of an old sawmill, gristmill and the surrounding industry dating back to the 18th century.

This former asylum for Black Americans is haunted by its history of violence and racism.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.