The tower-fortress was built in the second half of the 14th century of local limestone. Tower-strongholds were built by vassals to protect roads and waterways and to protect themselves against peasant uprisings. Construction of such tower-strongholds increased after the failed St. George's Night uprising by peasants in 1343.
In 1986, the fortress was restored under the leadership of Vao sovkhoz. Exhibition on the I floor introduces the history of Vao Tower-Fortress and Manor, and the surrounding villages. The II floor is a medieval dwelling that includes the washing area (place for washing hands), and dansker (dry toilet). The current furnishing imitates the pristine appearance of the room. The windows are of beautiful stained glass. The staircase in the wall leading to the cellar adds mysticism to the place. The III floor is enlivened by paintings created by the artist E.Veermäe which depict people in medieval clothing.
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.