The Standing Stones of Stenness, located in Orkney, Scotland, are a bunch of ancient rocks that have been standing around for ages. These stones are thought to be part of the oldest henge site in the British Isles, dating back to around 3100 BCE. People used to do all sorts of rituals and ceremonies around these stones, and even made promises by sticking their hands through a hole in one of the rocks! Nowadays, they're looked after by Historic Environment Scotland and are part of the cool World Heritage Site known as the Heart of Neolithic Orkney.