Under the auspices of the British Museum, C.T. Newton started excavations in 1857 on the site of one of the Seven Wonders of the World, the sepulchral monument to the Carian ruler, Maussollos. Sensational finds were made of sculptures in round and reliefs, but less attention was paid to the architectural remains of the superstructure, and afterwards it was made clear that supplementary investigations on the site would be needed, if a more complete and reliable reconstruction of the building was to be hoped for than that suggested by Newton and his collaborators. This volume describes the foundations of the Mausolleion laid within the large, rectangular cutting in the bedrock and named "the quadrangle" by Newton. In addition to architectural evidence of basic importance, its re-excavation by the Danish expedition in the years 1970-77 brought to light remains of Maussollos' tomb chamber and its treasures, among these the ornaments of gold plate and beads of semi-precious stones published in the present volume. The illustrations include a plan of the re-excavated foundations; elevations of cross-sections describing the principal features of the excavated area; excavation photos; and a plot plan of the principle levels.