Mayflower Society House Museum is 1 blk. w. of Plymouth Rock at 4 Winslow St. The original home was built in 1754 by Edward Winslow, a Pilgrim descendant and great-grandson of Edward Winslow of Massachusetts, third governor of the Plymouth Colony. The estate includes a formal garden and 10 rooms with furnishings and artifacts from the 17th, 18th and 19th centuries. The offices and library of the General Society of Mayflower Descendants are behind the mansion.