One Door that has been opened: St. John's Park in Hudson Street, -- once a graveyard.

One Door that has been opened: St. John's Park in Hudson Street, -- once a graveyard.

One Door that has been opened: St. John's Park in Hudson Street, -- once a graveyard.

The Seward Park on Opening Day.

The Seward Park on Opening Day.

The Seward Park on Opening Day.

The "Slide" that was the Children's only Playground once.

The "Slide" that was the Children's only Playground once.

The "Slide" that was the Children's only Playground once.

Open Air Gymnasium. - Crotona Park. Fulton Avenue and 173rd Street.

Old Mrs. Benoit in her Hudson Street attic, an Indian widow who lived there four years.

Bone Alley Park (Willett Street) site nearing completion in 1899.

Old Mrs. Benoit in her Hudson Street attic, an Indian widow who lived there four years.

Crowd at opening of a small park before it was made.

Crowd at opening of a small park before it was made.

Bone Alley Park (Willett Street) site nearing completion in 1899.

Crowd at opening of a small park before it was made.

Mulbery Bend Park taken in 1900.

The Old Marble Cemetery -- proposed for a play ground, taken in summer 1895.

Mulbery Bend Park taken in 1900.