The Tarxien Temples site consists of a complex of four megalithic structures built between 3600 and 2500 B.C. and reused between 2400 and 1500 B.C. Discovered in 1913 by local farmers, the site was extensively excavated between 1915 and 1919, with a number of minor interventions carried out in the 1920s, by Sir Themistocles Zammit, Director of Museums at the time. The earliest of the four structures, located at the easternmost end of the site and built sometime between 3600 and 3200 B.C., survives only to near ground level although its five-apse plan is still clearly visible. The South Temple, the most highly decorated of megalithic buildings with its relief sculpture and the lower part of a colossal statue of a skirted figure, and the East Temple, with its well-cut slab walls and ‘oracle’ holes, were built between 3150 and 2500 B.C. The Central Temple was constructed with its unique six-apse plan and contains evidence of arched roofing.