Prehistoric stone circle discovered in Yorkshire

A stone circle that was once part of a prehistoric cairn has been discovered by a group of amateur archaeologists on Ilkley Moor, Yorkshire, England.

A cairn is a large pile of stones that marked the grave of an important individual in prehistoric times. These stones were often taken away by later farmers for building walls or cottages, and sometimes all that's left is a circle of stones from the base, as is the case here. The team says the cairn measures 27 by 24 feet. It would have been pretty high back in its glory days.

One stone had a man-made circular impression archaeologists call a cup mark. These are found all over prehistoric Europe singly or in groups, but nobody knows what they mean.

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