A circular or ring-shaped stone structure, often prehistoric, such as a stone circle or circular arrangement of rocks.
From cyclo- (circle/ring) + -lith (stone, from Greek lithos). Named in 19th-century archaeology for ancient circular stone monuments.
Cycloliths like Stonehenge aren't just impressive piles of rocks—archaeologists now believe many served as calendars, aligned to track the sun and moon's movements, making them ancient observatories built from pure stone geometry.
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