Stenberga was an ancient castle built probably in the 14th century. It was fist mentioned in 1389 and built probably by Jakob Abrahamsson, the bailiff of Turku. In 1438 the castle was donated as the site for Naantali Bridgettines Abbey, but in 1443 the abbey was decided to move to the Ailos. The castle was located to the rock hill near Masku River. There has probably been a 13 x 13m tower made of stone.References:
The Peace Palace (Vredespaleis) is an administrative building and often called the seat of international law because it houses the International Court of Justice (which is the principal judicial body of the United Nations), the Permanent Court of Arbitration, the Hague Academy of International Law, and the extensive Peace Palace Library. In addition to hosting these institutions, the Palace is also a regular venue for special events in international policy and law. The Palace officially opened on 28 August 1913, and was originally built to provide a symbolic home for the Permanent Court of Arbitration, a court created to end war which was created by treaty at the 1899 Hague Peace Conference.