What makes for a Sense of wonder moment?

Thinking hard on this one, I think I can honestly say that the only gaming related sense-of-wonder experiences I can recall have been while reading the books, or maybe a decade ago (c.1991), trying to infer Glorantha trivia with a similarly minded friend. GMing is always looking at the scenery from the wrong side; and as player, the charge I used to get was adrenalin highs from chancy combat.

One how not to do it with a really nifty setting is to play tour guide. Taking one example from experience, visiting Tada's High Tumulus in game is likely to concern itself more with logistics than any “gosh wow” one might derive from taking the old RQ2 Prax map and talking out the consequences of assuming that it depicts the tumulus to scale, never mind whether the other players are or are not Glorantha groupies at the time.