 Although now all in a ruinous state and not retaining their original appearance , at the time of construction the Medway Megaliths would have been some of the largest and most visually imposing Early Neolithic funerary monuments in Britain . <unk> along the River Medway as it cuts through the North Downs , they constitute the most south @-@ easterly group of megalithic monuments in the British Isles , and the only megalithic group in eastern England . Archaeologists Brian <unk> and Mike <unk> deemed the Medway Megaliths to be " some of the most interesting and well known " archaeological sites in Kent , while archaeologist Paul Ashbee described them as " the most grandiose and impressive structures of their kind in southern England " . 
