The Descent
In 2006, action movies were all the rage. The Descent didn't get its proper attention until cult film fans picked up on this masochistic, hyper-stylized thriller. Imagine spelunking so deep into a cave system that you and your friends reach hell. That's what happens in this flick.
El Orfanato
There is no gore in this film. There are no jump scares, no emotionally distressed family members, and definitely no severed heads. This movie is about a woman who is on the hunt for her long-lost child, and a group of orphans who wear painted sacks over their heads. By the way, this movie might be the freakiest one in this list.