New York City's only wildlife rehabilitation center treats more than 3,000 feathered and furry patients each year.

Small monoliths of several varieties of stone sit alongside a wooded path in the Bronx.

An abandoned tuberculosis hospital moulders on into an uncertain future.

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

This secluded ruin was once a home for exotic plants.

An unassuming nature trail winds through dozens of tiny houses built for the wee people.

This sprawling woodland estate was the brainchild of iconic American industrial designer Russel Wright.

This lovely little pond is named after the hundreds of soldiers' corpses that were rolled into the waters during the French-Indian War.

This seemingly unremarkable boulder is said to bear the hoofprint of the devil himself.

Hidden inside one of the world's most well-visited zoos is a secret plaque promising eternal life.

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

The largest known open fault in the United States is basically a giant natural refrigerator.

New York City's only radical feminist independent bookstore.

Have a steam and some blini at this cafe in a century-old bathhouse.

A historic recreation of the golden age of the Erie Canal, abandoned for some time, slowly being restored.

Unusual books about food and drink abound in this 19th-century New York townhouse.

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

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

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

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

This art center is way beyond your average pumpkin-carving operation.

The attic and basement house two museums stuffed with oddities like swallowed spoon handles and a shrunken head.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

A collection of unique outdoor sculptures surounded by the beauty of nature.