Whether it was hunting animals, building boats, or leaving handprints on walls, cave art is a very clear and interesting documentation of all the adventures of early humans. It can also tell archaeologists a lot about the economy and beliefs of Bronze Age communities. While this art form largely died out after the invention of writing, a late 2,700-year-old example has just been discovered on a farm in Sweden. Forty petroglyphs emerged from beneath a layer of moss covering a massive boulder that was once a coastal cliff.
These glyphs were discovered and published by the Bohuslen Rock Carving Documentation Foundation, an organisation whose purpose is to help preserve and document the many glyphs in the area. The rock carvings of Tanum in the Bohuslen region are also a UNESCO World Heritage Site. Like the most recent finds, they date from the Nordic Bronze Age (1700-500 BC) and were created by picking and polishing rocks with a carving tool.