Hot Metal Happening on the Northside! Join Rivers of Steel Arts (RoSA) at the Tripoli Street Bake Yard on April 22 from noon-3 p.m. for free pizza and aluminum casting demos. Learn about our exciting events and opportunities available to Pittsburghers this year at the Carrie Furnaces National Historic Landmark. Mingle with your neighbors and watch RoSA’s experienced foundry team cast objects in molten aluminum . Be sure to bring the kids and a experience this vital part of Pittsburgh’s legacy - molten metal!