Last year I've watched a trailer which starts like a classic horror movie; youth people go to a camp in a rural area and all the classic boring things happen. Then they find a building and an elevator in it and things change.
Can anyone recognize?
It sounds like The Cabin In The Woods from Joss Whedon.
At some point in the movie the last 2 college students discover the elevator to the store room, where all the monsters are kept.