People Silhouettes Furnace at Night Cityscape, Sparks Are Flying. Workers Are Doing Show For Tourists at Festival of High Temperatures in Wroclaw City, Poland. Tourists Are Watching the Festival on a Square Outdoors. Preparation of the Casting Forms, Molds. Furnaces For Clay and Enamel Burning. Glassworks. Casting of Iron Into the Molds. Workers in Safety Clothes, Gloves, Helmets and Screens. Tour to Wroclaw, Tourism in Poland