An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

The remains of what was once the world's steepest passenger funicular.

A collection of the best toys ever made, The National Toy Hall of Fame is filled with kids, fun, and for some reason, a bird preserve.

An old dining hall now serves up ghost stories for lusty locals.

This locally-famous crevasse in New York State is icy all year round.

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

A former connection to City Island, it has been abandoned since the 1930s.

Toxic waste disaster that founded the Superfund program.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

This once sprawling resort now sits abandoned, filled with graffiti and vibrant colors from an era long passed.

A mysterious echo seems to defy the laws of acoustics.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

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

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

Records of the dead describe the myriad odd ways people used to die.

Comprehensive gaming collection of over 30,000 electronic games and consoles.

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

Three acres of mythology-inspired sculptures are visible from the highway.

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

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

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.