, ▁by ▁Ne ol ith ic ▁far ming ▁communities . ▁They ▁differ ▁from ▁the ▁contemporary ▁long ▁bar rows ▁through ▁their ▁struct ural ▁use ▁of ▁stone . ▁ ▁There ▁is ▁a ▁huge ▁variety ▁of ▁meg al ith ic ▁tomb s . ▁The ▁free - standing ▁single ▁chamber ▁dol m ens ▁and ▁portal ▁dol m ens ▁found ▁in ▁Brit t any , ▁Den mark , ▁Germany , ▁Ireland , ▁Netherlands , ▁Sweden , ▁Wales , ▁and ▁elsewhere ▁consist ▁of ▁a ▁large ▁flat ▁stone ▁supported ▁by ▁three , ▁four , ▁or ▁more ▁standing ▁stones . ▁They ▁were ▁covered ▁by ▁a ▁stone ▁c air n ▁or ▁earth ▁bar row . ▁ ▁In ▁Italy , ▁dol m ens ▁can ▁be ▁found ▁especially ▁in ▁S ardin ia . ▁There ▁are ▁more ▁than ▁ 1 0 0 ▁dol men ▁d ating ▁to ▁the ▁Ne ol ith ic ▁( 3 5 0 0 – 2 7 0 0 ▁BC ) ▁and ▁the ▁most ▁famous ▁is ▁called ▁Dol men ▁di ▁Sa ▁C ove cc ada ▁( near ▁M ores ▁). ▁During ▁the ▁Bron ze ▁Age , ▁the ▁Nur ag ic ▁civil ization ▁built ▁c . ▁ 8 0 0 ▁Gi ants ' ▁grave , ▁a ▁type ▁of ▁meg al ith ic ▁gallery ▁grave ▁that ▁can ▁be ▁found ▁throughout ▁S ardin ia ▁with ▁different ▁structures . ▁ ▁The ▁earliest ▁meg al ith ic ▁tomb s ▁in ▁S ardin ia ▁are ▁the ▁circular ▁gra ves ▁of ▁the ▁so - called ▁Ar z ach ena ▁culture , ▁also ▁found ▁in ▁C ors ica , ▁southern