The town came under rule of the Romans until the Normans conquered it in 996 AD and built a medieval town around the summit of the 950 feet high hill, including a castle and four gates (ruins today). In 1507, rule passed to Isabella, Duchess of Bari, and under her rule Ostuni thrived during the Italian Renaissance, with an abundance of Renaissance architecture left behind.
Lime is readily available in the surroundings of the city since the town itself is built upon three hills of Cretaceous limestone. The White City has become such a popular destination for tourists that the government pays for half the cost of homeowners repainting their homes every two years to keep them looking their whitest.
La Processione della Grata - On the second Sunday of August, this procession leaves the Sanctuary della Grata to go to the center of the city and, and in the evening the candles of over six thousand people light up the countryside which can be viewed from the city's walls.
Sagra dei Vecchi Tempi - Feast of the Old Times. August 15th is a local food festival with many traditional dishes.
Cavalcata di Sant’Oronzo - a celebration of the town’s patron saint, takes place between the 24th-27th August. The high point are costumed knights and a procession on horseback.
Festa di San Biagio - On February 3rd, thousands of pilgrims go to the sanctuary of San Biagio carved into the side of the limestone hillside, just outside of town. The Sanctuary is notable for a huge, ancient sinkhole considered by speleologists the biggest underground cavity in Puglia. Visitors can enjoy the natural landscape in the surrounding area.- Via dei Colli, Ostuni, Puglia
Just remember to bring your sunglasses if you plan on visiting Ostuni -- it's that white.