Indiana Jones and the Fate of Atlantis/Nightmare Fuel

"Maybe they're animal bones.
 * The comic's version of.
 * In the game, the inner circles of Atlantis start to become this as time goes by, especially if you haven't rescued Sophia yet. Up until now, the Lost City hasn't seemed too frightening: the hallways are immensely wide and brightly lit, the ruined architecture is a little too grand to be frightening, and the Nazis are always patrolling the area to provide a reassuring series of fist-fights; after the canals, the random encounters end, and you're allowed to wander freely through the dimly-lit claustrophobic hallways of the second circle, all alone except for the eerie carvings on the walls and the skeletons on the ground.
 * Another element that adds a layer to the creepiness factor: the skeletons themselves. Maybe it's just the graphics, but quite a few of them look as though they died screaming in agony. If you decide to examine the bones, you can hear the uneasiness in Indy's voice as he describes them.

No animal I know about has bones like these...

These bones are weirdly twisted.

Any human being with bones like this had to have been diseased.

Some of the skulls bear half-grown horns.

Maybe they weren't human at all, but... something else..."