So this amazing film is really Jurassic Park! A theme park gone awry. The late great Michael Crichton wrote and directed Westworld (his second outing as director after TV movie Pursuit), a pretty damn fine way to start.
Set in the future the idea of three separate theme parks, Roman World, Medieval World and Westworld. Our heroes, James Brolin and Richard Benjamin visit Westworld where they encounter bad boy gunslinger Yul Brynner (looking remarkably like his character Chris from The Magnificent Seven) who turns nasty when a virus infects the Futureworld computer system. Crichton was inspired to write this after visiting Disneyworld. Imagine the Dumbo ride where the elephants come alive and crush everyone riding in them.
The comparisons to JP are obvious but the technology is so much different, In Westworld when water is thrown into robot Gunslingers face the sizzle as his circuits burn was created by crushed Alka-Seltzer which, when water splashed on it the sizzle was created.

The influence of characters on future films is always interesting: John Carpenter based the indestructible central character from Halloween on Yul Brynner’s never stopping gunslinger.
The Roman World gardens in the film were shot in Harold Lloyd’s Greenacres Estate. (Harold Lloyd the silent movie star).
Crichton had many of his novels turned into movies. Aside from Jurassic Park there have been Coma, The Andromeda Strain, Sphere, Eaters of the Dead (which became The 13th Warrior), The Lost World : Jurassic Park, Congo, Disclosure as well as writing E.R.