Short answers, pulled from the story.
The Altes Museum was built between 1825 and 1830 by order of King Frederick William III of Prussia, according to plans by architect Karl Friedrich Schinkel. It was inaugurated on the 3rd of August 1830.
Since 1904, the Altes Museum has solely housed the Antikensammlung, the Collection of Classical Antiquities. Since 1998, the Greek collection, including the treasury, has been displayed on the ground floor, with special exhibitions on the second floor.
The Altes Museum is considered a major work of German Neoclassical architecture. As part of the Museum Island complex, it was listed as a UNESCO World Heritage Site in 1999, recognized for its testimony to the development of the museum as a social and architectural phenomenon.
Near the end of the Second World War, a tank truck exploded in front of the building, badly damaging it. The frescoes designed by Schinkel and Peter Cornelius, which adorned the vestibule and the back wall of the portico, were largely lost as a result.
The Altes Museum stands on Museum Island in the historic centre of Berlin, surrounded by the Berlin Cathedral to the east, the Berlin Palace to the south, and the Zeughaus to the west. Schinkel positioned it as part of a symbolic ensemble where each building represented a different kind of authority, with the museum standing for science and art.
Museum Island, including the Altes Museum, was listed as a UNESCO World Heritage Site in 1999. The designation recognized the complex as testimony to the development of the museum as both a social and architectural phenomenon.