Seili is an old place of exile, where first lepers and then the insane were kept beginning in the 1600s. In today's world the merciless treatment of the exiled seems cruel. When you went to Seili, there you stayed. The only treatment came in the form of God's word, water from health springs and spirits, which the exiled inhabitants has a right to distill.
Seili's wood church, which is still in excellent condition, was completed in 1733. When the church is open, visitors can admire the austere beauty of the log walls and a high partition, behind which the lepers were forced to listen to many a fire-and-brimstone sermon. Visitors can then take a contemplative stroll around the church grounds, which are filled with wooden crosses marking the final resting places of the island's former inhabitants.
Seili does not offer any real tourism services. Instead, the island is home to University of Turku Archipelago Research Institute.