A prehistoric tomb, often megalithic in construction, that contained a large burial chamber. Such a vault was usually used for successive burials over a long period of time. The term is also used for a rock-cut tomb, especially the shaft-and-chamber tomb, with a similar burial rite. Chamber tombs were built in many parts of the world and at many different times. The European varieties were called court cairn, dolmen, entrance grave, gallery grave, giants' grave, hunebed, passage grave, portal dolmen, tholos, transepted gallery grave, and wedge-shaped gallery grave. Many were rectangular chambers cut into the side of a hill and approached by a long entrance passage (dromos), especially in the Aegean.