Neolithic (c. 4500-2200 B.C.)
Stonehenge, Wiltshire, England (2950-1600 B.C.)
megalith
henge
barrow
dolmen
post and lintel
capstone
Aubrey holes
sarsen ring
bluestone ring, bluestone horseshoe
trilithons
heel stone
solstice
station stones
charnel house
the "cursus"
Beaker people (2600 B.C.)
Druids
Celts (c. 500 B.C. - 50 B.C.)
Avebury (2,600 - 2,500 B.C.)
Silbury Hill
Lugnasadh
Newgrange (3,100 B.C.)