Return to the Cathedral - Thief 1 scariest freakin level in ANY game EVER (including any silent hill/Resident evil crap you can think of)
q3dm17 - quake 3 arena facing worlds - unreal tournament hall of heroes - guild wars (pre-nightfall) de_dust - counter strike dm_crossfire - Half-life Durance of Hate lvl 3 - Diablo 2 Unholy Altar - Diablo 1 (check http://diablo.wikia.com/wiki/Unholy_Altar) The Lost Woods - The Legend of Zelda : Ocarina of Time (this one was a love/hate relationship) Dune 2 Last campaign map (was the same for both atreides, harkonnen and ordos) (will put more if i remember them)