Franklin Roosevelt fell for his distant cousin Eleanor, his mother Sara took him on a cruise to dissuade him from pursuing her. The couple married on 3/17/1905. As a wedding present, Sara built her only child and his bride a townhouse in Manhattan’s Upper East Side, designing and furnishing it herself. What the Roosevelts didn’t realize when they accepted her generous offer was that the plan included an adjacent home—complete with connecting doors on every floor for Sara to inhabit.