Cromlechs and other prehistoric architecture exits in Wales. There are also menhirs, dolmens and cromlechs. Plas Newydd is near one of 28 cromlechs that remain on uplands overlooking the sea. In 1796 it was included on a list of Anglesey cromlechs in the Cambrian Register. Standing stones can be found isolated or forming circular arrays (stone circles or cromlechs). Some of the dolmens and cromlechs are burial sites serving also as border markers. This period saw the construction of many chambered tombs particularly dolmens or "cromlechs". Cromlechs called "harrespils" lie on the western slope of the massif.