I really enjoyed Gemini Rue and Primordia, most of wadjet eye's catalog is pretty high quality.

I also would recommend Lost Horizen, which was very Indiana Jones like, and done quite well. Another game, Heart of China by dynamix is in the same vein.

An interesting older one is Dreamweb, which has great visuals and a kickass soundtrack, but you may need a walkthrough handy since you can pick up almost any object that isn't nailed down, but only a few of them are useful.

Lastly, the old 1997 Bladerunner punches above its weight, with some amazing mechanics that I haven't seen in any other game. NPC's will notice how you treat others, and have the ability to warn other NPC's they interact with, which will influence how they respond to your questions, to the point that they will lie to you. It's also replayable, since the replicants are different characters every playthrough. The main designer did a really fantastic interview about the game on Ars Technica that I'd recommend watching (though it does contain spoilers, so beware).