The Countless Stones in kent. I tend to alternate that with a picture ofa pylon from Arminghall Henge, Norwich. Gotta love the pylons.
http://users.tinyonline.co.uk/bigh/bigh/pylonof.htm
It turns out if you view on HH it is the Arminghall Pylon. Those on TMA get the Countless stones one. Nice!