dolmen a type of megalithic thomb

age ancient archaeological archaeology archeology architecture background beautiful boulder boulders burial chamber construction countryside cultural culture dolmen dolmens drente drenthe dutch environment europe forest giant granite grave graves green heritage historic historical history holland hunebed hunebedden landmark landscape megalith megalithic megalitic monument natural nature netherlands old outdoor outdoors outside part prehistoric prehistory rock rocks rural sky stone stones thomb tomb tourism touristic travel tree type work