My nearest cache is about 20 foot up a tree, and I've never managed to scramble up and get it. There's a similar one at the other end of the village too, but I've never been able to spot that one from the ground.
Few hundred metres away is one on an island in the middle of a big pond, heh.
Was never a fan of non-traditional caches, mystery caches, etc. Used to be a super cryptic series in Winchester about kings and queens, but I never finished it before some of them were removed / lost.
Might might investigate again