HDC occupies an old factory building, and has two main displays. One is a film about the early iron and steel industry, which were, along with the related mining and railroads, key to Johnstown's history. Not just the floods, but the rich history of immigration and the ethnic churches and neighborhoods. And the second exhibit is about just that -- the experience of immigrants. There are other features, including a children's museum, and an exhibit dedicated to the various wares that Johnstown manufacturing produced in days gone past -- from glassware to hot water radiators so many of us used. There is also, during growing season, of a display of plants that are native to this area, with a wonderful overview of the Cambria City neighborhood, which was the home of so many ethnic groups. BTW, do NOT use the mailing address on your GPS. Use 699 Broad St., Johnstown. THAT will get you to the entrance of the HDC parking lot.