Dalarö is Haninge Municipality's oldest locality, originally an old maritime pilot and customs community. Today Dalarö is largely characterized by the developments which were added in the late 1800s, when the area became a popular summer resort for Stockholmers. Dalarö has long been home to Swedish high society's seaside houses. Since the 19th century, the town of Dalarö has been a fashionable holiday resort for the international upper class. Dalarö is also a desirable family resort for the wealthy. The historical valuable buildings are of national interest. Dalarö and the surrounding built-up area has a diverse year-round[clarification needed] and summer cottages. During the summer months Dalarö is frequented by a large number of tourists.