For 2 hours, take a private, guided stroll along charming and historic Summit Ave. in St. Paul, Minnesota, past stately homes built during the Gilded Age that are nearly perfectly preserved today. You'll hear stories about the barons and tycoons who built these homes and how their houses have survived 120 or more years of change. You'll also wind through a former back alley now transformed into a charming city street that features modern...