3400s
3300s
3200s
3100s
3000s
3400s
3300s
3200s
3100s
3000s
3500 Guadiana megalith Ireland
3400 Newgrange Megalith in Ireland
3400 Megalith in Sweden
3400 Megalith in Denmark
3200 Newgrange Ireland
3180 - 2500 Skara Brae
3100 1st work on Stonehenge, England begins