), ▁Spain ▁( Los ▁Mill ares ), ▁Sic ily , ▁Belg ium ▁( Ar den nes ), ▁and ▁Or k ney , ▁as ▁well ▁as ▁the ▁first ▁h eng es ▁( circ ular ▁earth works ) ▁in ▁Britain . ▁ ▁Chal col ith ic ▁ ▁c . ▁ 2 5 0 0 ▁BC : ▁Const ru ctions ▁in ▁Brit t any ▁( Le ▁Men ec , ▁K erm ario ▁and ▁elsewhere ), ▁Italy ▁( O tr anto ), ▁S ardin ia , ▁and ▁Scotland ▁( n ortheast ), ▁plus ▁the ▁clim ax ▁of ▁the ▁meg al ith ic ▁Bell - be aker ▁culture ▁in ▁I ber ia , ▁Germany , ▁and ▁the ▁British ▁Is les ▁( stone ▁circle ▁at ▁Stone hen ge ). ▁With ▁the ▁bell - be akers , ▁the ▁Ne ol ith ic ▁period ▁gave ▁way ▁to ▁the ▁Chal col ith ic , ▁the ▁age ▁of ▁co pper . ▁c . ▁ 2 5 0 0 ▁BC : ▁T omb s ▁at ▁Al gar ve , ▁Portugal . ▁Additionally , ▁a ▁problem atic ▁d ating ▁( by ▁opt ically ▁stim ulated ▁lum ines c ence ) ▁of ▁Qu inta ▁da ▁Que im ada ▁Men h ir ▁in ▁western ▁Al gar ve ▁indicates ▁" a ▁very ▁early ▁period ▁of ▁meg al ith ic ▁activity ▁in ▁the ▁Al gar ve , ▁older ▁than ▁in ▁the ▁rest ▁of ▁Europe ▁and ▁in ▁parallel , ▁to ▁some ▁extent , ▁with ▁the ▁famous ▁An atol ian ▁site ▁of ▁Gö bek li ▁Te pe " ▁ ▁c .