While Tales From The Crypt may have been the most infamous horror comic series of the 1950s, there were many more horror comics, most which had faded into obscurity with the creation of the Comics Code and have since resurfaced in modern times.
The following comic is featured in The Horror! The Horror!: Comic Books the Government Didn't Want You to Read!, which showcases some of the more obscure 50s horror comics.
In this tale, "Nightmare World", a curious scientist goes on a nightmarish acid trip that ends up becoming more reality than dream: