The first wooden church of Kristiinankaupunki was built between 1654 and 1658 on the site where the Ulrika Eleonora Church now stands, however it burned down on 16th June 1697. The building of the Ulrika Eleonora Church, which replaced it, was completed in 1700. The church was renovated and returned to use in 1965. The wooden church is a typical seaside church complete with a votive ship hanging from the ceiling. The ship building skills are also otherwise evident in the architecture of the church, for example in the ceiling structure. Outside the church is an old graveyard where the significant families of the city are buried. This churchyard also holds the graves of warriors of Kristiinankaupunki. Only a few services are held in the church each year. Ulrika Eleonora is a popular venue for summer weddings.
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.