Take a look at Jason and the Argonauts for a prime example. Ray Harryhausen does a lot to make a believable setting in which gods and mortals coexist; Colossal statues come to life and undead skeletal warriors rise up from the ground to fight. It's obvious to your average movie goer that these are films from years gone by and that computers weren't used to create the images, but some of the effects achieved are very easy to believe; not in a this-has-got-to-be-real way, but the suspension of disbelief comes quite easily.
In Jason and the Argonauts, our hero will assemble a great crew (including Hercules), and face a 100-foot bronze giant, the venomous Hydra (a huge creature with the heads of seven snakes), an army of enchanted skeletons and an impassible channel. On the way, they are helped out (and hindered) by the gods.
Jason and the Argonauts is a retelling of Greek classic and, as ancient as the story is, the movie is surprisingly suitable for the modern movie goer. While excellent special effects (for its time, mind you) help it to stay timeless, its acceptability by the modern audience probably has more to do with the fact that even our most modern of heroes and even our concept of epic battles of good versus evil can be traced back to the Greek classics.
If you're trying to make a girl think you have some class, selecting a few somewhat campy movies to watch with friends or just want to see a action-filled classic, you should pick up Jason and the Argonauts.