The dolmen of Alto de la Tejera Nature · Carrascosa de la Sierra, Almarza, Soria Discovered in 1985, it has a circular chamber 3.80 metres across formed by six large blocks and is considered unique in the province; it served as a burial place four or five thousand years ago. Photo: Wiki42 (CC BY-SA 4.0) What to see and do in Carrascosa de la Sierra