Kiviloo was founded as an Episcopal castle in 1413. The few ruins of the Episcopal castle (destroyed in the Livonian War in 1558) can be seen even at present. The current eclectic manor house (in private possession) was built during the ownership period of the von Stackelbergs in about 1906-1910 (the earlier wooden structure was burnt down in 1905).
Reference: Estonian Manors
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.