Unesco World Heritage Site Alberobello resembles an urban sprawl – for gnomes. The zona dei trulli on the westernmost of the town's two hills is a dense mass of 1500 beehive-shaped houses, white-tipped as if dusted by snow. These dry-stone buildings are made from local limestone; none are older than the 14th century. Inhabitants do not wear pointy hats, but they do sell anything a visitor might (or might not) want, from miniature trulli to woollen shawls.
The town is named after the primitive oak forest Arboris Belli (beautiful trees) that once covered this area. It's an amazing place, but also something of a tourist trap – from May to October busloads of tourists pile into trullo homes, drink in trullo bars and shop in trullo shops.
If you park in Lago Martellotta, follow the steps up to Piazza del Popolo, where the Belvedere Trulli lookout offers fabulous views over the whole higgledy-piggledy picture.