Eglise Saint-Etienne d'Appeville was formerly dependent on the Abbey of Lessay. It is noted for the its solid style and the uniformity of its construction. It was built in the beginning of the 13th century and is almost unaltered, a nearly perfect expression of Cotentin rural Gothic art. At its centre, a square tower forming the lantern tower and bell tower, topped by a slender spire. Single nave, choir with shallow chevet, prominent transept, sexpartite vaults, 15th century porch.
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Carlsten is a stone fortress built on the orders of King Carl X of Sweden following the Treaty of Roskilde, 1658 to protect the newly acquired province of Bohuslän from hostile attacks. The site of Marstrand was chosen because of its location and its access to an ice free port. Initially a square stone tower was constructed, but by 1680 it was reconstructed and replaced by a round shaped tower. Successive additions to the fortress were carried out, by the inmates sentenced to hard labour, until 1860 when it was reported finished. The fortress was decommissioned as a permanent defense installation in 1882, but remained in military use until the early 1990s.
The fortress was attacked and sieged twice falling into enemy hands. In 1677 it was conquered by Ulrik Frederick Gyldenløve, the Danish military commander in Norway and in 1719 by the Norwegian Vice-Admiral Tordenskjold. At both occasions the fortress was returned to Swedish control through negotiations and treaties.