"The Beyond" (1981) Horror Flick

In 1927, artist and warlock Schweick works on a painting in Room 36 of the Seven Doors Hotel, in New Orleans, Louisiana. He protects one of the seven gates of hell, which if opened, will bring about the end of the world and the death of mankind. He is dragged from his room by a lynch mob to the hotel basement and killed for practicising black magic. Meanwhile, a white-eyed woman reads from the ancient tome "Eibon", prophesizing the opening of one of the seven gates of hell.

In 1981, Liza Merrill inherits the hotel and moves from New York City to refurbish and reopen it. A worker later glimpses a white-eyed woman through a window and falls off his scaffolding. Local doctor John McCabe takes the injured man to hospital. The bell for Room 36 rings, but as the hotel has yet to open, Liza dismisses it as malfunctioning. A plumber, Joe, later investigates the lack of running water. In the flooded basement, he uncovers a bricked off area and accidentally opens the gate to hell. He is attacked by a ghoul, blinded, and killed. The bodies of both Joe and Schweick are discovered by a maid, Martha, and are taken to the local hospital morgue.

While driving to town, Liza encounters a blind woman named Emily and her guide dog, Dicky. Emily warns Liza that reopening the hotel would be a mistake and she should return to New York. At a bar, John urges Liza to give up on the hotel project. However, she refuses, thinking that it is her only remaining chance at financial success.

Later, Emily tells Liza about Schweick and Room 36, warning her not to go up there. Upon examining Schweick's painting, she states it was part of his seance, and his own assassination counted as a sacrifice to curse the land. After Liza scoffs at the warnings, Emily's hands begin to bleed causing her to run with Dicky from the hotel in terror. Liza notices that neither of them made audible footsteps as they left. Despite Emily's warning, Liza enters Room 36 and discovers the Eibon, as well as Schweick's corpse nailed to the bathroom wall. She returns to Room 36 with John, but both the Eibon and the corpse are gone. Liza also tells John about her encounter with Emily but he is skeptical, insisting that there is no blind woman living in town. Furthermore, he says that the house where Liza claims Emily lives has been abandoned for years.

Meanwhile, Liza's architect, Martin, visits the town library to inspect the hotel's blueprints. The blueprints reveal a large, unexplained space in the basement. Upon discovering this, Martin is knocked off his ladder by an unseen force, breaks his neck, and is paralyzed. As he lies helpless on the floor, spiders eat him alive. Back at the hotel, Martha is cleaning the bathroom in Room 36 when Joe's corpse emerges from the bathtub water and kills her. John breaks into the old house where Emily is supposed to live. It is abandoned, but he finds the Eibon and begins to read it, learning that the hotel is apparently one of the seven gates to hell.

Emily is confronted in her home by the animated corpses of Schweick and the other recently deceased. She commands Dicky to attack and although the dog chases away the undead, he next turns upon Emily, killing her.

Liza returns to the hotel basement and is attacked by an undead worker. In her escape, she runs into John again at the entrance. Upon investigating, there is no sign of the undead worker, and Liza begins to question her own sanity. They drive to the hospital and find it deserted except for a Dr. Harris, Joe's daughter Jill, and a horde of the undead. Harris is killed by flying glass and John dispatches Jill when she transforms and attacks Liza.

John and Liza escape down a staircase but discover they have once again arrived in the basement. They proceed through the flooded labyrinth and stumble into a wasteland—the same landscape in Schweick's painting. No matter which direction they turn, they find themselves back at their starting point. They are ultimately blinded just like Emily, and disappear.