2010 marks the 1600th anniversary of the end of Roman Britain in AD410. So the length of Hadrians Wall was lit up with torches every few hundred yards along its entire length from coast to coast.
I didn't have time to take part in this event but I did have a drive along part of the route.
http://news.bbc.co.uk/1/hi/england/8565759.stm
http://www.illuminatinghadrianswall.com/