Alberobello is universally known as the capital of Trulli. Its drywall constructions are made of roughly worked limestone, with a conical roof. Each one has a different dimension and some of them have two floors. The roofs of the buildings often bear mythological or religious markings in white ash and terminate in a decorative pinnacle whose purpose is to ward off evil influences or bad luck. Inside they have alcoves, a fireplace and small windows.
Their construction techniques allow for good insulation: they are cool in summer and warm in winter. Since 1996 UNESCO has included Alberobello in the World Heritage List.