The Museum Island in Berlin is a historical and cultural complex located on an island in the River Spree. The island is home to five important museums that deal with various aspects of culture, art and history. The first museums on the island were built in the 19th century, including the Altes Museum (1830), the Neues Museum (1855) and the Alte Nationalgalerie (1876). The Pergamon Museum (1930) and the Bode Museum (1904) were added later. The museums on the island are famous for their important collections and exhibitions, which range from antiquity to the present day. The Museum Island has been a UNESCO World Heritage Site since 1999 and is an important place for the preservation and presentation of Berlin's and the world's cultural and historical treasures.