Even though Själö has been mental asylum at least since 1680s the current hospital building was built in 1851. The buildings were designed by famous architect Pehr Johan Gylich and this group of Empire style stone-made buildings is unique in the archipelago. Former mental hospital is now part of the Turku University and people are making science here, so do not wander around too much. One patient room in the ground floor is still in its original shape. Also Restaurant Seili and public toilets are in the ground floor.
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This wooden church built in 1733 is the only one in Finland having separate nave for lepers, and the interior is worth of seeing. The church does not belong to any parish and is maintained by Finnish Forest Administration. According to a legend the leprosy patients were buried under the meadow next to the church. However, nobody knows where the bodies actually are. Those resting in the graveyard are mostly mentally ill women and some mental hospital staff.