Ferropolis, "the city of iron", is an open-air museum of huge mid-20th century industrial machines in Gräfenhainichen, a city between Wittenberg and Dessau, Germany. These can measure up to 30 meters high and 120 meters long, and weigh up to 1,980 tons. The area is also used for several events such as opera performances or music festivals, including the Splash! Festival, Melt! Festival, and the "Ferropolis in Flammen" ("Ferropolis in flames") festival.