One scenario is that a major earthquake in around 1200 BC caused the destruction at Mycenae and other centres. Great buildings collapsed at Tiryns; the survivors of the disaster built small temporary structures in the citadel, then constructed a well-planned new town outside. Pylos, the Menelaion, Zygouries, Midea and Eutresis were destroyed in 1200 BC and never rebuilt. Other centres like Mycenae and Tiryns were rebuilt and survived only to be destroyed later in the twelfth century. One – Athens – was never completely destroyed.