Across Europe, about 40,000 long barrows are known to survive from the Early Neolithic.[1] They are found across much of Western Europe; stretching from southeast Spain up to southern Sweden and taking in the British Isles to the west.[1] The long barrows are not the world's oldest known structures using stone—they are predated by Göbekli Tepe in modern Turkey—but they do represent the oldest widespread tradition of using stone in construction.[24] The archaeologist Frances Lynch has described them as "the oldest built structures in Europe" to survive,[25] while Field noted that they are the earliest monuments surviving in Britain.[4] Although found across this large area, they can be subdivided into clear regionalised traditions based on architectural differences.[1]