All good shots. Processing is good except for the green in #2. Not consistent and too yellow compared to 1 & 3. Easily fixed with selective color change to yellow or green channel by increase in cyan and black.
Man I would love to check this place out in person I love places of history.
good post processing I think bynx was talking about #2 and not #3
that #2nd shot does have strong yellow
i commented on this earlier, wonder what happened to my post:x
anyway, once again, i think you have done a nice job, except i find the green in #2 to be a bit too much for my taste. very natural processing and fits the subject matter.
I find HDR seems to screw up the sky colors and grass. Too dark blue sky like a polarizing filter was used. The grass comes out like Simpsons nuclear yellow green. That might be subjective too. But its just poor use of the controls for something approaching a natural look. Especially when everything else looks good.