Nightmare Fuel / Turok

• The eerie atmosphere of the first game. You are completely alone, with no one to talk to, in an area you do not understand, with the only things that don't attack you on sight are wildlife who flee from you.
• The Catacombs, the burial grounds and home base of the Ancient Warriors, this place is crawling with them with screams from people you cannot see echoing throughout your exploration. There's also the fact that the Pur-Lin smash the walls to ambush you.