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On the western shore of the Oslofjord: coast, islands and farmland.
Information checked on 10 October 2026.
The town calls itself the country's oldest, with an official founding date of 871, which historians debate. On the Slottsfjellet hill: the ruins of Tunsberghus fortress and St Michael's church, and an 1888 stone tower overlooking the town.
In Horten, one of Northern Europe's largest groups of burial mounds, from about 600 to 900: some fifty monuments, some 45 m across. The Midgard Viking centre (2000) and its rebuilt chieftain's hall (2013) explain them.
Opened in 1917, Europe's only museum devoted to whaling traces Norwegian large-whale hunting from 1860 to 1960; it displays a life-size blue whale and the whale catcher Southern Actor (1950).
At the tip of Tjøme, "World's End" opens onto Færder National Park, created in 2013: 355 km², 96% of it sea, islets and smooth rocks. The park's visitor centre is on site; some areas close during the seabird nesting season.