Össeby-Garn Church is a local parish church, located near the northern tip of Garnsviken. Built in the 13th century (with a porch added in the 15th century), Össeby-Garn Church is a Romanesque stone church typical of Uppland. Two runestones have been placed outside the church, and another has been built into the church floor.
References:Duino Castle was built by the Wallsee family in 1389 on the cliffs overlooking the Gulf of Trieste. It replaced an older castle from the 11th century. Over time, the Wallsee family disappeared and the castle, after having been used as a prison, became the residence of the Luogar and Hofer.
At the end of the 19th century it became the property of Prince Alexander von Thurn und Taxis from the Czech branch of the House of Thurn and Taxis. It remains with the family to this day with his great-grandson Prince Carlo Alessandro della Torre e Tasso, Duke of Castel Duino the current owner. The castle has been opened to the public as a museum and park.