The Calderstones, thought to be the oldest monument in Liverpool can be found in the Harthill Greenhouse at Calderstones Park having been moved from their original site. Quote from an old document
"An old gardener, when a boy at Calderstones farm informed me that the Calderstones did not originally form a circle, but lay on the top of a large mound by the roadside, partly buried, and forming a kind of cist. When the roads were widened, the stones were set up in a circle, as they now stand — one was set in Mr. Booker's field A large quantity of burnt bones, found when the mound was removed, were spread on the fields for manure. He saw no vases or earthenware of any sort, nor did he hear of any arms, coins, or metal, or stone implements being found. The stones lay level with the mound, and boys cut their names and footmarks on them, still visible."
More detailed informaition
Link