The Brimham Rocks near Nidderdale, Yorkshire Dales, England are said to have been carved by druids, but they date back to around 320 million years ago when the Yorkshire area formed from sand and other materials washed down from Norway and Scotland, leaving an area known as the Millstone Grit. Later glaciers carved the land down, leaving the strangely-shaped stones exposed, in the period from roughly 73,000 BC to 10,000 BC. The rocks now stand at a little less than 30 meters tall. Some rocks resemble animals or human faces, and have been named for their appearance or for the local legends that grew up around them. The Brimham Rocks area is owned by the National Trust and is open daily for visitors. Image by floato