tectonics. The African continental shelf is in constant movement towards Europe. Its subduction underneath the Eurasian plate generates magma, which rises to the surface to form the volcanoes. The "Aeolian Arc" extends for more than , but the area of geological instability caused by the collision of Africa and Europe is much larger. It includes Sicily, Calabria, and Campania together with Greece and the Aegean islands. Administration The islands form part of the Sicilian province of Messina. All the islands except Salina comprise the commune of Lipari within that province; Salina forms three separate communes: Malfa, Leni and Santa Marina Salina. Architectural control Curbing urban development has been a key in preserving the Aeolian islands in a natural state. New buildings are severely restricted. Existing residences can be bought and restored but they must be constructed to resemble its whitewashed houses. Traditional houses consist of modular cubes constructed from indigenous building materials like stone, lava, pumice, and tufo. Almost all houses have a huge outdoor terrace, usually shaded by grape and flowering vines. Mythology In Homer's epic poem, the Odyssey, Aeolus, son of Hippotes, was the divine keeper of the winds and king of the mythical, floating island of Aeolia. He kept the violent winds locked safely away inside the interior of his isle, releasing them only at the command of greatest gods to wreak devastation upon the world. The hero of the epic poem, Odysseus, on his travels to return home from Troy, visited Aiolos' isle and was entrusted with a bag containing all of the winds to ensure a safe voyage home. However, during the trip, the hero's companions opened the bag and the escaping winds carried their ship all the way back to Aiolos' shore. History 4000–2500 BC The first evidence of Sicilian migration was in Lipari (Castellaro Vecchio culture). A manufacture and commerce of obsidian objects was highly developed until the introduction of metals. 1600–1250 BC During the Bronze Age, the Aeolians prospered by means of maritime commerce in an area which extended from Mycenae to the British Isles, from where tin was imported. Villages on the Aeolian islands flourished on Capo Graziano (Filicudi), Castello (Lipari), Serro dei Cianfi (Salina), Capo Milazzese (Panarea), and Portella (Salina). All these settlements were destroyed by new Italic invasions in 1250 BC. 1240–850 BC According to Diodorus Siculus, the Aeolian Islands were occupied by the Ausones led by Liparus. Liparus