Ahhhh! Indy 3 - that one's a true highlight of all adventure-games. I remember the time it came out (grandpa's talkin' o' the old days...) - it just smashed --> whew!!! It was the first Lucasfilm Game that was not just pretty good - it came along with that marvellous gameplay. I remember that we made that legendary session, watchin' the film first and then we played the whole game from the start. (I think it must have been early morning or somethin' when we were through - but we made it!). Yeah - the old days. But I can tell you - this one's still a great choice, if you haven't played it. It's not a mere fun adventure like Monkey Island (though there are quite a lot of jokes in this one), it also has the historical aspect. And of course it's the game to the movie. You know, it HELPS having seen it, but it's not really necessary (though I strongly recommend it, simply because it's a good movie...).
So, what d'ya gotta do? Simple - just find the holy grail! (Can't be that difficult just because of millions of heroes, including King Arthur etc., having searched for it...!) On your way you do pretty a sightseeing-tour throughout the world, including the catacombs of Venice (look picture above). One of my favorite games ever, and surely one of the best adventures ever made. Playin' this one also explains the (not so few) jokes about "selling these leatherjackets" in other Lucasfilm Games - I won't tell ya - play it! You know I love all of my games (Mmmmmhh!) - but this one is amongst the few that I'd call essential.