The founder of the world’s biggest textile company. A German-born carpenter and home builder. A flea-circus impresario. A house sold with a restored 1939 Cadillac. And a house with a garage containing an outcrop of granite too big to allow a car into it. That’s who and what you’ll find when you look into the most interesting historic home sold in February. One of the houses may have had more super-rich owners than any other in Greensboro, perhaps the Piedmont.