During the Nordic Bronze Age from c. 1700 - 500 BC, an advanced civilization appears in Denmark, parts of Sweden and parts of Norway.
The period between 2300 and 500 BC was the most intensive petroglyph-carving period in Scandinavia, with carvings depicting agricultural activities, animals, hunts, ships, ceremonies, warfare, etc. Petroglyphs with themes of a sexual nature has also been found in Bohuslän, dating from 800 to 500 BC.