Two gems of Beaux Arts architecture that have been sitting vacant for years.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

This abandoned train tunnel has been the subject of countless ghost stories for years.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

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

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This abandoned amusement park was built on a site with a dark history.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The whole world in one water tank.

A remarkable time capsule of American manufacturing deep in Maryland coal country.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

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

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

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

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

A hidden alley in urban Baltimore is a haven for graffiti artists.

Bizarre Cavern.

An eerie, decaying ghost town destined to fade into the forest.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

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