I've got this film on a double sided US import DVD that has "Tombs..." in a slightly less edited form that's a couple of minutes longer and has "Return Of The Blind Dead" on the other side.
Tombs Of The Blind Dead (the first of 4 "Blind Dead" films) is an atmospheric variation on the undead/zombie genre. You won't get the usual lumbering, half-rotted zombies. These ones are skeletal, undead Templar knights from the 13th century, killed by villagers for their human sacrifices and blood-drinking practises that gained them immortality. They rise creepily and slowly from their graves centuries later. They're blind and hunt by sound (their eyes were pecked out by birds after the villagers hung them) which gives the director a chance to engineer some decent suspense. And they sometimes ride around on horseback in eerily soundtracked slow motion.
This film is quite slow-paced but genuinely creepy at points. If you're a gore fan you may be disappointed (there is some) but it's a pretty good film that manages a few very suspenseful sequences. Quite an effective, haunting soundtrack.
It's well worth a look. Filmed in Spanish with English subtitles.