A castle built for love, and abandoned due to heartbreak.

Town full of spiritualists, some of whom are mediums, is still in full swing after 130 years.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

Rummage through this sunken ship, but leave your scuba gear at home.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

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

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

One man's swirling six-acre monument of stone.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

Avoid gangster interaction while window-shopping.

Lie in a hammock where George Washington stood.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

Once America's longest-manned military fort, now an abandoned hulk.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

Collapsing castle on the Hudson river was once the storage site of military surplus business.