Self-sufficient greenhouse floating on the Hudson River.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

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

The "Skinny House" is made from scrap, salvage, and a neighbor’s kindness.

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

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

The rustic think-space of famed naturalist John Burroughs stands exactly as he left it.

This derelict building used to house infirm Freemasons, their widows, and orphans.

This stone gatehouse was once the entrance to a historic mountain resort, and it had a cameo in a cheesy cult horror movie.

This whimsically unique butterfly farm focuses solely on creating habitats for the gentle insects.

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

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

Glacial erratic or man-made dolmen? It probably wasn't druids.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.