Penne is one of the few known locations with petroglyphs in Agder, Southern Norway. It’s not a very large site, and it is dated to around 1000 BCE in the Nordic Bronze Age. Typically of the Norwegian Bronze Age petroglyphs, “jordbruksristninger”, the site mainly features ship figures. There are also some cup marks.
There is a coastal fort, The Nordberg Fort, from World War 2 located fairly close the petroglyphs. It offers a nice view of the area and it is worth taking the climb up to the fort if you are in the area.