▁ ▁c . ▁ 3 5 0 0 ▁BC : ▁Const ru ctions ▁in ▁Spain ▁( M ál aga ▁and ▁Gu ad iana ), ▁Ireland ▁( s outh - west ), ▁France ▁( Ar les ▁and ▁the ▁north ), ▁Mal ta ▁( and ▁elsewhere ▁in ▁the ▁Mediter rane an ), ▁Belg ium ▁( n orth - east ), ▁and ▁Germany ▁( central ▁and ▁south - west ). ▁ ▁c . ▁ 3 4 0 0 ▁BC : ▁Const ru ctions ▁in ▁S ardin ia ▁( circ ular ▁gra ves ), ▁Ireland ▁( New gr ange ), ▁Netherlands ▁( n orth - east ), ▁Germany ▁( nor thern ▁and ▁central ) ▁Sweden ▁and ▁Den mark . ▁ ▁c . ▁ 3 3 0 0 ▁BC : ▁Const ru ctions ▁in ▁France ▁( C arn ac ▁stones ) ▁ ▁c . ▁ 3 2 0 0 ▁BC : ▁Const ru ctions ▁in ▁Mal ta ▁( Ħ a ġ ar ▁Q im ▁and ▁Tar x ien ). ▁ ▁c . ▁ 3 1 0 0 ▁BC : ▁Const ru ctions ▁in ▁Russia ▁( D ol m ens ▁of ▁North ▁C au cas us ) ▁ ▁c . ▁ 3 0 0 0 ▁BC : ▁Const ru ctions ▁in ▁S ardin ia ▁( ear liest ▁construction ▁phase ▁of ▁the ▁pre histor ic ▁alt ar ▁of ▁Monte ▁d ' Acc od di ), ▁France ▁( Sa um ur , ▁D ord ogne , ▁L angu ed oc , ▁B isc ay , ▁and ▁the ▁Mediter rane an ▁coast