The new Long Barrow at All Cannings is designed to align to the midwinter solstitial sunrise, with the rising sun flooding the passageway with light.
Adam's Grave Dec 21st
Kitchen Barrow June 21st
West Kennet Sept 21st
And of course Stonehenge June 21st
(note sunset along Great Trilithon)
Click any to enlarge - and follow link to SunCalc to play with the alignments.