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Tove Jansson, famous for her Moomin books, lived her summers with Tuulikki Pietilä on this rock in the outer archipelago (with a tiny cottage by famous architects Reima and Raili Pietilä) for 25 years. One week each summer the island is open for visitors on guided tours or with their own boats. The guided tours include 2×30 min travel from Pellinge and 45 min on land, and are arranged twice daily for 6–8 persons per tour, with reservations at least 14 days in advance. The rest of the year it is rented for one week at the time, based on applications. The terrain is rough. Pets are not allowed. Landing is not possible in rough weather, overnighting is not allowed.
Borgå domkyrka
A heavy, squat, white stone building, this church wins no awards for architectural innovation, but it's among the oldest and largest in Finland, with parts dating back to the 11th century. Predating the Reformation, it was built as a Catholic church, but was somewhat crudely converted into a Protestant one later on by removing icons and painting over murals. The building burned four times between 1300 and 1700, and took a direct hit from a bomb in 1914 – miraculously, the bomb fell through the roof, but did not explode. The roof was burned by an arsonist in 2006, but the damage was repaired and it's now open again, with some of the Catholic-era murals restored in the process. The diocese of Porvoo comprises the Swedish-speaking parishes of Finland.
Taidetehdas
A culture and congres centre, where you can get to know the milieu of the old factory, visit the art hall and participate in various events.
Lelumuseo
Contains over 1000 dolls and hundreds of toys dating from 1800 to 1990. Open from June 1st to August 10th only.
Porvoon museo
History and art museum in the heart of the Old Town, housed in the former City Hall (1760). The Diet of Porvoo – where the Russian emperor promised to let Finland keep its Swedish law, language and religion under Russian rule – was held here, and today it showcases artefacts from peasant life and a collection of old photographs.
Home of national poet Johan Ludvig Runeberg (1804–1877), more or less as it was when he lived here with his family in the 1860s, including the garden where there also is play site for children.
Albert Edelfeltin Ateljeemuseo
A museum dedicated to the Finnish artist Albert Edelfelt (1854–1905).