I'm going to include Raynham Hall, my favorite haunted place on Long Island. Dating back to the 1700s, this historic house in Oyster Bay, NY, was originally built by a well-to-do merchant, and is now a museum open to the public.
While visiting Raynham Hall years ago, I spoke with the woman selling tickets and asked about the house's legends of hauntings. She told me a story from years back, when a man was hired to take care of the grounds and sleep in the house. After his first night there, he was asked how he slept. He answered that it was quiet, but that the "people upstairs" made quite a racket. Note to fans of ghost stories: no one lived upstairs.
Other stories talk about visitations by a young woman in a bridal gown -- supposedly the ghost of a former resident who was abandoned by her lover while waiting for him at the altar.
You can read more about haunted places on Long Island at the Long Island Paranormal Investigators website.