The church of St. Michael (Mihkli) was built in the mid-15th century and it is the biggest one-nave church in Estonia. It was originally constructed as a fortress church; two meter thick walls, narrow windows and the surrounding moat made it easy to defend. The church has been damaged in wars and restored several times.
The unique detail of the Jõhvi church is a great vaulted cellar, which is today renovated as a chapel and museum.
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.