Scariest Skyrim and New Vegas locations?

I was wondering if anyone had suggestions for the scariest places to visit in Skyrim and New Vegas?

For New Vegas, the cazador labs in Old World Blues. Encountering cazadors in the wide open plains of the Mojave is goose bump inducing, being forced to fight a bunch in close quarters is just...shit city.

new vegas... probably the courier's mile for a scariest enemy standpoint. Dead Money in general is pretty scary too

The lowest level of Vault 11 in New Vegas was pretty scary.