c.4000 - Construction of the "Sweet Track" (named for its discoverer, Ray Sweet) begun; many similar raised, wooden walkways were constructed at this time providing a way to traverse the low, boggy, swampy areas in the Somerset Levels, near Glastonbury; earliest-known camps or communities appear (ie. Hembury, Devon).
c.3500-3000 - First appearance of long barrows and chambered tombs; at Hambledon Hill (Dorset), the primitive burial rite known as "corpse exposure" was practiced, wherein bodies were left in the open air to decompose or be consumed by animals and birds.
c.3000-2500 - Castlerigg Stone Circle (Cumbria), one of Britain's earliest and most beautiful, begun; Pentre Ifan (Dyfed), a classic example of a chambered tomb, constructed; Bryn Celli Ddu (Anglesey), known as the "mound in the dark grove," begun, one of the finest examples of a "passage grave."
c.2500 - Bronze Age begins; multi-chambered tombs in use (ie. West Kennet Long Barrow) first appearance of henge "monuments;" construction begun on Silbury Hill, Europe's largest prehistoric, man-made hill (132 ft); "Beaker Folk," identified by the pottery beakers (along with other objects) found in their single burial sites.
c.2500-1500 - Most stone circles in British Isles erected during this period; pupose of the circles is uncertain, although most experts speculate that they had either astronomical or ritual uses.
c.2300 - Construction begun on Britain's largest stone circle at Avebury.
c.2000 - Metal objects are widely manufactured in England about this time, first from copper, then with arsenic and tin added; woven cloth appears in Britain, evidenced by findings of pins and cloth fasteners in graves; construction begun on Stonehenge's inner ring of bluestones.
