I strongly agree. Case in point, in MM7, I had never known of that chest that was on the hill just outside Pierpont. Specifically, the one that's near where the Druid Promotion quest giver resides. Never had I looked over that hill/mountain, until I'd poked through this Tavern in detail.
After reading about it, I'd decided to go and see for myself. Took some intense looking, but there it was, just as described!
Which makes me wonder what else is hidden in MM6 and MM7 that, to this day, still has yet to be discovered!