A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

An eccentric playboy's astounding natural history collection.

Every December the Wannalancit Mills lights a Christmas Tree over the old mill's smokestack.

A gravestone marks where a man's lost limb was laid to rest.

An elaborate, hidden model train in the Needham Town Forest.

The world’s largest underground marble quarry is hiding in Vermont.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

Unicorns, elephants, and bears, oh my!

No one really knows how these old hobby horses got here, but the herd keeps growing.

An unusual library of dead things at the Rhode Island School of Design.

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

Whale bones, scrimshaw, and sperm oil make up just a part of this comprehensive collection of whaling history.

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

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

This dam in the woods, built by Henry Ford with only manpower and oxen, holds no water and serves no purpose.

The vaguely man-shaped root that ate the body of the founder of Rhode Island.

Books bound in human skin and H. P. Lovecraft's letters are among a few of the treasures this library has to offer.

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

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

250-year-old farm now features sculptures, a petting zoo and a hippy-bazaar.

This forgotten graveyard in rural New York State once served a pioneering hospital.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

The small burial plot is located in a mall parking lot.