Hawthorn Hill (Wright Brothers)

In 1911, the Wrights began to build a mansion in Oakwood, a suburb of Dayton, Ohio. It was finished in 1914, and Orville, his sister Katharine, and their father Milton moved in. Wilbur, unfortunately, had died in the interim. After Orville's death in 1948, the National Cash Register Company bought the mansion and used it for a guest house, although they kept two rooms, including Orville's study, just as they were when the last inventor of the airplane passed away.