A stone circle is an ancient monument. It is made of several standing stones, usually menhirs that are arranged in a certain way. Very often those stones form circles or ellipses. The number of stones can vary between four and 60.^[1] Very often, burial sites are in the circle, or nearby. There are about 1,000 stone circles and 80 stone henges in the Great Britain and Ireland.^[2] Most likely stone circles were used for rituals. They might also have been used as calendars; some stone circles are arranged so that certain stones are lit on special dates, such as the summer solstice.

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