Mesolithic: St Lythan's Cromlech, Glamorgan.
RE/52D1/6

Neolithic: West Kennet Long Barrow, Wiltshire. Used between 3700 and 1600BC.
RE/43A1/7

Neolithic: Waylands Smithy, Oxfordshire. Built around 3700BC and enlarged around 3400BC when the large front stones were added.
RE/31A1/3

Late Neolithic: Tomb complex, Mull Hill, Isle of Man. About 3000BC.
PH/25M/1

Early Bronze Age: Ring marks, Achnabreck, Kilmartin Glen, Argyll. About 3000BC.
RH/62K2A/7

Early Bronze Age: Stone carvings, Newgrange, Co Meath. About 3000BC.
XTE/IR17N1/16

Bronze Age: Stonehenge, Wiltshire. About 2000BC. From A Hundred Wonders of the World, 1821.
BS/HP/03

Iron Age: Uffington Castle, Oxfordshire.
FG/31A/11

Iron Age: Cley Hill, Wiltshire.
FG/43J/3

Iron Age: Old Sarum towards inner keep, Salisbury, Wiltshire.
BH/43S1D/2

Iron Age: Burrough Hill, Leicestershire.
CU/23A1A/12

Late Iron Age: Staigue Ring Fort, Co Kerry, thought to date from between the first century BC and the fourth century AD, its purpose remains unclear.
MSM/IR8I1A/2