Eberswalde (ˌʔeːbɐsˈvaldə) is a major town and the administrative seat of the district Barnim in the German State (Bundesland / federated state) of Brandenburg, about 50 km northeast of Berlin. Population 42,144 (census in June 2005), geographical location . The town is often called Waldstadt (forest town), because of the large forests around it, including the Schorfheide-Chorin Biosphere Reserve. Despite this fact, Eberswalde was an important industrial center until the German Reunification. The area around Eberswalde was already populated in Paleolithic. Before the establishment of the Margraviate of Brandenburg it was the place of a Slavic stockade. The Treasure of Eberswalde, the largest pre-Christian gold treasure from the area of today's Germany was found here. Today the treasure is located in the Pushkin Museum in Moscow. The town of Everswolde ("forest of the boars") was established in 1254 by the Ascanian margrave Johann I. It was first mentioned in a document dated April 23, 1276 when margrave Albrecht III. resided there. In 1300 it received market rights. From the year 1317 the main trade route between Stettin and Frankfurt (Oder) went through the city. A major fire struck the city in 1499. After rebuilding the town, Eberswalde became the first industrial town of the Margraviate of Brandenburg, with huge metallurgy capacities. Some parts of the town are still named from their past function, like Kupferhammer ("copper hammer"). 1605 till 1620 the important waterway Finow Canal was built. During the Thirty Years' War Eberswalde was besieged and conquered several times by nearly every important faction of the war. The general of the Catholic League, Albrecht von Wallenstein, resided in the town, later Gustavus Adolphus of Sweden, who did not survive the battle of Lützen, was embalmed in the town's Maria Magdalena church. Both parties forced the town population to support their troops. After the end of the war only 33 of formerly 216 houses still stood and of an original population of 1200 only 168 survived, 28 of which had full citizen status.