Kiệt tác bí ẩn trên đá
Hơn 100 bức hoạ trên đá có từ hàng nghìn năm trước đây vừa mới được phát hiện ở phía bắc nước Anh. Chúng bao gồm một quần thể những phiến đá được thiết kế theo kiểu kiến trúc những vòng tròn đồng tâm..
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