Not exactly his only one. If Revival isn't Lovecraft, then it owes Lovecraft its existence; same with "N."cdemares said:Read the short story "Jerusalem's Lot" by Stephen King. It's his one Lovecraft story and it's good.
As far as horror stories go, none has scared me as much as the Amityville Horror, but I freely admit I have an idiosyncratic anger/fear response toward haunted houses.