It is a curious fact that Five Wells Chambered Tomb [Map] is, within 0.2 of a degree of longitude, north of Stonehenge [Map] - see Five Wells Chambered Tomb and Stonehenge Alignment. Moreover, this line of longitude, give or take 500m, has the highest number of Neolithic and Early Bronze Age Monuments on it when compared to other lines of longitude. North to South:

Five Wells Chambered Tomb [Map]

Long Low Barrow [Map]

Willersey Barrow [Map]

Farmington Long Barrow [Map]

Monkton Fields Long Barrow [Map]

East Kennet Long Barrow [Map]

Adam's Grave [Map]

Knap Hill [Map]

Netheravon 6 Long Barrow [Map]

Knighton Long Barrow [Map]

Larkhill Long Barrow [Map]

Amesbury Barrow 14 G1 [Map]

Normanton Barrow 151 G13 [Map]

Stonehenge.