Underworld (2003)

There is a war between vampires and werewolves, there are beautiful women between vampires (it seems women, or beautiful women cannot be werewolves) and they are all immortal. Relatively immortal. Do you know what kills vampires? Light? Well, it is actually the UV rays in the light. I know this because the Lycans (Werewolves) developed some UV bullets to kill vampires. The 'treatment' for werewolves is silver - so you know, just in case. The movie doesn't have an unbelievable plot or anything but it is clean and it has a nice mystery atmosphere. I also liked the nice cars, the empty, sort of medieval city - generally the mixing of modern technique and ancient books in wood-and-silver covering. The movie successfully ignored humans - it made me believe that, even if there might be humans around, a completely parallel history with that specific rhythm and problems, where days (as daylight) are negligible and where full moon is a significant thing. Talking about 'possible worlds' - I found this believable.