Sammallahdenmäki is a Bronze age burial site in Finland in Lappi municipality. It was designated by UNESCO as a World Heritage Site in 1999, and includes 36 granite burial cairns dating back more than 3,000 years, to 1,500 to 500 BC. It is located on a hill in a remote area off the road between Tampere and Rauma. Originally, it was near the coast of the Gulf of Bothnia, but the land has risen so it is now 15 kilometers from the sea. It is one of the most important Bronze Age sites in Scandinavia.
Four of the cairns were excavated by archaeologist Volter Högman in 1891, including Kirkonlaattia ("Church Floor"), an unusual rectangular cairn covering 16 x 19 metres with a flat top, and Huilun pitkä raunio ("long ruin of Huilu"), which is surrounded by an ancient stone wall.