Detail of Trulli house. Focus on background. Alberobello was founded in the 15th century on land that was originally an oak forest in the province of Bari. A typical feature of Alberobello are Trulli houses made of white dry-stone with conical roofs of lapidary stones embellished with decorations and pinnacles of various shapes, often symbolising religious signs or signs of the zodiac. In 1996, th