He was born in Iceland, but moved to Milwaukee, WI in 1873. Thordarson bought the island and built several cottages for himself, families, and friends on the southwest side of the island. The rest of the island was mostly left untouched so that Rock Island would keep its natural beauty forever. Today, Rock Island is a state park where families can camp, hike, swim, or fish. It's a great place to get away and relax.
Some people say the island is indeed enchanted.