Dolmen

A dolmen is a type of single-chamber megalithic tomb.^[1] It usually consists of three or more upright stones (megaliths) supporting a large flat horizontal capstone (table).

Poulnabrone dolmen in County Clare, Ireland

A dolmen erected by Neolithic people in Kerala, India

Most date from the early Neolithic period (4000 BC to 3000 BC). Dolmens were usually covered with earth or smaller stones to form a barrow, though in many cases that covering has weathered away, leaving only the stone "skeleton" of the burial mound intact.