Join the 1.5 million annual visitors who are thrilled and educated while touring the largest science and technology museum in the world. The German Museum processes over 100,000 items representing 50 scientific specialties. About 28,000 objects are on display. There is also an extensive library containing 850,000 books and documents. The Deutsches Museum complex is located on Museum Island (Museumsinsel). During the Middle Ages, this stretch of river gravel was called Coal Island. The 21.25 acre wedge is flanked by two river flows, the Great Isar and the Kleine Isar.