A Breton cromlech. Any Neolithic monument consisting of a large, flat stone supported by two or more rocks (like a table). It used to be believed that such monuments were altars for human sacrifice or cannibal feasts. With the advent of modern day grave-robbing and archaeology, dolmen were discovered inside of burial mounds with the supposed meal underneath the table. Science concluded that they formed a vault and supposed that exposed versions were either incomplete tombs or windblown remains. Cromlechs and dolmen are the same thing, but since French is considered more chíc than Welsh, the latter term is preferred by the scientific community these days.