Recently I've started reading some of the classics, and I'm hoping to watch some of the movie versions after I read the books. Ok, I guess they're not all sci-fi and fantasy but the majority of them are.
I've already watched the Bela Lugosi and Gary Oldman Draculas so I'm happy with those.
The ones I'm most interested in are:
THe Invisible Man
HP Lovecraft's stories
Alice in Wonderland/Through the Looking Glass
Arabian Nights (whole thing or individual stories)
Dr. Jekyll and Mr. Hyde (I've seen and loved the James Nesibitt/Michele Ryan Jekyll mini, but that's a sequel not an adaptation)
Hunchback of Notre Dame
Count of Monte Cristo
Journey to the Center of the Earth
Crime & Punishment
Man in the Iron Mask
Cyrano De Bergerac
Red Badge of Courage
Uncle Tom's Cabin
King Solomon's Mine
Phantom of the Opera
20,000 Leagues Under the Sea
Legend of Sleepy Hollow
The Time Machine
Let's see, what can I help you with....
The Invisible Man: Definitely the Claude Rains version from the 30's. Best movie version, and probably most faithful.
Alice in Wonderland: There isn't a faithful adaptation. Not a one. The Disney version is iconic, but mediocre. The Tim Burton sequel is awful. The best one I've seen is a completely unfaithful, but utterly creepy, Swedish (I think) version that all takes place within a house. Anyone else know what I'm talking about? It's really haunting. Otherwise, you're out of luck. Just reread the books.
Peter Pan: The recent live action version is really very good. (2003, I think.)
Hunchback: Not at all faithful, but the really underrated and entertaining and surprisingly twisted cartoon by Disney is well worth watching. The villain in the cartoon, the judge, is the scariest and most complex villain in any Disney cartoon in history (and his song Hellfire will send shivers down your spine.)
Journey to the Centre of the Earth: There's a good version from the 60's, I think. Again, not completely faithful, but a lot of fun. I remember a chicken being one of the main characters.
Legend of Sleepy Hollow: The Tim Burton version is a masterpiece. Unforgettable imagery, and a twisted sense of humour.
Beowulf: The recent-ish animated version by Robert Zemeckis was excellent when I saw it in 3d. I don't know how well it will translate on the small screen, but it's worth a shot.
Sherlock Holmes: The Jeremy Brett series is perfection. Completely faithful in character and tone.