The Hills Have Eyes Movies: Classic Timeline
The original Wes Craven timeline consists of his 1977 cult classic and its widely panned 1985 sequel. While the original remains a landmark of '70s horror cinema, the sequel is considered one of the worst horror sequels ever made.
Craven himself disowned Part II, which he only directed out of financial necessity after the poor reception of his previous films. The sequel is infamous for excessive padding with flashbacks to the original film and features a notoriously absurd flashback sequence for a dog. Most fans consider the 1977 film a complete story on its own. You've been warned.
There are 2 other watch orders available - see the links up above.

The Hills Have Eyes
When the Carter family's RV breaks down in the remote desert, they become trapped and terrorized by a clan of savage cannibals hiding in the nearby hills.

The Hills Have Eyes Part 2
A motocross team ventures into the desert to test a new super-fuel, unaware that their guide Rachel has a dark connection to the area's dangerous past. They soon find themselves facing the same deadly threats that plagued previous visitors to this remote wasteland.
Other Film Series
David Lynch
Visionary surrealist filmmaker known for his exploration of dream logic, suburban darkness, and the mysteries lurking beneath everyday American life.
Ed Wood
The cult filmmaker known for Plan 9 from Outer Space and his collaboration with Bela Lugosi, celebrated for his passionate low-budget filmmaking.
Insidious
A supernatural horror series exploring The Further, a terrifying spirit realm where malevolent entities prey on the living.
Poltergeist
A supernatural horror franchise following families terrorized by malevolent spirits, featuring an original trilogy and a standalone reboot.
Saw
A horror franchise centered on the elaborate death traps and moral philosophy of serial killer John Kramer, known as Jigsaw.
The Omen
A supernatural horror franchise following the Antichrist Damien Thorn from his sinister origins through his rise to power, plus a modern remake.