The Altes Museum is a listed building on the Museum Island in the historic centre of Berlin, Germany. Built between 1825 and 1830 by order of King Frederick William III of Prussia according to plans by Karl Friedrich Schinkel, it is considered a major work of German Neoclassical architecture. It is surrounded by the Berlin Cathedral to the east, the Berlin Palace to the south and the Zeughaus to the west. Currently, the Altes Museum houses the Antikensammlung and parts of the Münzkabinett. As part of the Museum Island complex, the Altes Museum was listed as a UNESCO World Heritage Site in 1999, in recognition of its testimony to the development of the museum as a social and architectural phenomenon.

The Museum Island is a museum complex on the northern part of the Spree Island in the historic heart of Berlin, Germany. It is one of the capital's most visited sights and one of the most important museum sites in Europe. Originally, built from 1830 to 1930, by order of the Prussian Kings, according to plans by five architects, the Museum Island was designated a UNESCO World Heritage Site in 1999 because of its testimony to the architectural and cultural development of museums in the 19th and 20th centuries. It consists of the Altes Museum, the Neues Museum, the Alte Nationalgalerie, the Bode-Museum and the Pergamonmuseum. As the Museum Island designation includes all of Spree Island north of the Karl Leibniz avenue, the historic Berlin Cathedral is also located there, next to the open Lustgarten park. To the south of Leibniz avenue, the reconstructed Berlin Palace houses the Humboldt Forum museum and opened in 2020. Also adjacent, across the west branch of the Spree is the German Historical Museum. Since German reunification, the Museum Island has been rebuilt and extended according to a master plan. In 2019, a new visitor center and art gallery, the James Simon Gallery, was opened within the Museum Island heritage site.