Minneapolis Mayor Sharon Sayles Belton broke ground today (THURSDAY) on the Mill Ruins historical park, a patch of Mississippi riverbank east of the Stone Arch Bridge near downtown. The sandy ground used to be the front line of the city's milling district, which led the world in flour production for 50 years. The tiny patch of riverfront was so valuable that competing mills touched each other and in some cases, shared outer walls. Today, most of the mills are gone. The few that remain are one street over and undergoing major rennovations -- most are being converted into high end lofts and condominiums. But the crumbled remnants of several mills still poke out of the ground below...and are being unearthed a little more each day by a team of archaeologists. Bob Clouse is with the Minnesota Historical Society. He gave me a tour of the park this week.