This is where artworks taken from German museums ended up as war reparations after 1945. Paintings from the Dresden Gallery were returned, but Priam’s Treasure, the golden hoard of jewellery and artefacts that Heinrich Schlieman had taken from Troy and had given to the Pergamon Museum in Berlin, were not. These were eventually put on display in the Pushkin Museum in 1993 and remain a bone of contention. Among other priceless items from antiquity is the 18ft-long Moscow Mathematical Papyrus from Egypt, dating from around 1850BC.