Under the Shadow
Under the Shadow is one of the few horror movies based on true events that are both accurate and equally terrifying. The story is centered around a mother and daughter who are fighting to stay alive in Tehran in 1988. This was when the War of the Cities portion of the Iran-Iraq war had divulged into raid bombings exclusively.
Poltergiest
If you weren't haunted by the menacing clown mask and Carol Anne's floating toys as a kid, then you were probably born before we were. This supernatural classic is as good as it was the day it came out, and it deserves all the critical acclaim that it's received over the years.