Although the collections centre on Mesopotamia, most of the surrounding areas are well represented. The Achaemenid collection was enhanced with the addition of the Oxus Treasure in 1897 and objects excavated by the German scholar Ernst Herzfeld and the Hungarian-British explorer Sir Aurel Stein. Reliefs and sculptures from the site of Persepolis were donated by Sir Gore Ouseley in 1825 and the 5th Earl of Aberdeen in 1861. Moreover, the museum has been able to acquire one of the greatest assemblages of Achaemenid silverware in the world. The later Sasanian Empire is also well represented by ornate silver plates and cups, many representing ruling monarchs hunting lions and deer. Phoenician antiquities come from across the region, but the Tharros collection from Sardinia and the large number of Phoenician stelae from Carthage are outstanding. Another often overlooked highlight is Yemeni antiquities, the finest collection outside that country. Furthermore, the museum has a representative collection of Dilmun and Parthian material excavated from various burial mounds at the ancient sites of A'ali and Shakhura in Bahrain.