The problem with sites being left to nature is that they very soon become bramble encrusted ..
15 years ago ...
http://www.irishmegaliths.org.uk/zBallyglass.htm
4 years ago ...
http://www.megalithomania.com/show/image/1902
I keep avoiding going back here because everytime it is more and more obscured. This is one of the most important tombs in Ireland :-(