http://www.landscape-perception.com/
Don't think this has been mentioned?
It's an RCA project about Preseli and Avebury by Jon Wozencroft and Paul Devereaux - 'an archive of sounds and sights'
I think this brilliant project deserves a 'thread' to itself. The Avebury section includes the Silbury sun roll, a great piece of work over 2009/2010 by Steve Marshall, Pete Glastonbury and George Currie.