Waco,
It was reading Martin Middlebrooke's book that resulted in me standing on Lochnagar crater's edge in 1986 and meeting a very old chap who told me that he had "got out of my trench over there, walked 50 yards, and got shot there"
Been back numerous times since, and it always has the same haunting effect. The crater itself was bought by a Brit, Richard Dunning in the 70's to protect it. There's a small charity, 'The Friends of Lochnagar' that looks after it
Lochnagar Crater - The Official Site