Rogalin is primarily famous for its 18th-century baroque palace of the Raczyński family, and the adjacent Raczyński Art Gallery, housing a permanent exhibition of Polish and international paintings (including Paul Delaroche and Claude Monet and the famous Jan Matejko's large-scale painting Joanna d'Arc). The gallery was founded by Edward Aleksander Raczyński. Rogalin is also known for its putatively 1000-year-old oak trees on the flood plains of the Warta and the historical St. Marcellinus Church, whose design was inspired by the Roman temple Maison Carrée in Nîmes, France.
The last owner of the estate was Count Edward Bernard Raczyński, who in 1979–1986 was President of the Polish Republic in exile. His sarcophagus is deposited in the Raczyński Mausoleum, under the church in Rogalin. In his testament, Count Raczyński bequeathed his estate in Rogalin (including the family palace, gallery, library, and church) to the Polish people.
References:Kristiansten Fortress was built to protect the city against attack from the east. Construction was finished in 1685. General Johan Caspar von Cicignon, who was chief inspector of kuks fortifications, was responsible for the new town plan of Trondheim after the great fire of 18 April 1681. He also made the plans for the construction of Kristiansten Fortress.
The fortress was built during the period from 1682 to 1684 and strengthened to a complete defence fortification in 1691 by building an advanced post Kristiandsands bastion in the east and in 1695 with the now vanished Møllenberg skanse by the river Nidelven. These fortifications were encircled by a continuous palisade and thereby connected to the fortified city. In 1750 the fortress was modernized with new bastions and casemates to protect against mortar artillery.