The Art Museum is located at the neoclassic-style barracks (built in 1798) of the Lappeenranta fortress. The museum has a collection of Finnish visual art from the 1850´s to the present day. This collection includes works by many well-known artists such as Arvi Liljelund, Pekka Halonen, Tyko Sallinen, Hjalmar Munsterhjelm and Jalmari Ruokokoski.
The main emphasis of research and collections is on the Kymi province and the region of the ceded Karelia (Vyborg). There are also some temporary exhibitions.
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.