For International #WorldHeritageDay, a thread about the threat of climate change to these incredible places. Starting off at the Heart of Neolithic #Orkney World Heritage site in #Scotland at one of the world's oldest stone circles, #StonesOfStenness. Skara Brae at the edge of Skaill Bay on Mainland, Orkney is, one of the best preserved Stone Age villages in Europe but is increasingly under threat from coastal erosion and worsening storms, & the Ring of Brodgar is vulnerable to extreme rainfall.