I was a monster kid in the 1970's. I only had a few spooky records back then, but I listened to them all the time. These are my favorites --
Sounds To Make You Shiver! - Released on the Pickwick label in 1974. Great sound effects and "story" album. You can download the album from Scar Stuff here.
A Story Of Dracula, The Wolfman And Frankenstein - Released by Power Records in 1975. Download it from Scar Stuff here.
These next ones are more sci-fi than monster, but they're still really cool. Back in the day I used to get Starlog magazine and they ocassionally included a flexi-disc record. Galactic Sound Effects (1979) and Greatest Science Fiction Themes by Neil Norman and his Cosmic Orch. are two of those records. You can download them from Bongolong Land here.