Lapped at by the sea on three sides and taken over by holidaymakers and their yachts in summer, this summer station was already popular with the Russians in 1723 for its thermal baths. The island of Kailo, beyond the yacht port, is the stronghold of the Moumine family. The old town was built up around the convent. Following a fire in 1628, Naantali was rebuilt along the lines of a plan of a medieval town. Numerous wooden buildings date from the 18C and 19C. A major classical music festival is held every June.