The Pergamon Museum (German: Pergamonmuseum) is situated on the Museum Island in Berlin. The building was designed by Alfred Messel and Ludwig Hoffmann and was constructed over a period of twenty years, from 1910 to 1930. The Pergamon Museum houses monumental buildings such as the Pergamon Altar, the Ishtar Gate of Babylon, and the Market Gate of Miletus reconstructed from the ruins found in ancient Middle East. The museum is subdivided into the antiquity collection, the Middle East museum, and the museum of Islamic art. It is visited by approximately 5,135,000 people every year, making it the most visited art museum in Germany (2007), and is one of the largest in the country.