TE - The League of Extraordinary Gentlemen is based on a VERY cool comic book series written by Alan Moore, the gent who wrote From Hell which was made into a movie with Johnny Depp.
If you like good adventure stories you should definately check out the comic. It is available in a collected Graphic Novel at many books stores and most self-respecting comic shops.
The story centers around a secret group that is backed by the British Government and is made up of characters from literary history. Alan Quartermain (the dude who found King Solomon's mines), Mina Murray (Jonathan Harker's bride from Dracula), Captain Nemo (an Indian Prince who really doesn't like Brits that much), Dr. Jeckyl and his nasty Alter-ego, and the Invisible Man (who is a rather devious chap). Their group is overseen by a Mr. Bond who works for the Queen. There are tons of other characters and situations from other books that have found there way into the stories. Everyone from Sherlock Holmes, Fu Manchu, Alice from Wonderland, Gulliver, John Carter- Warlord of Mars, H.G. Welles War of the Worlds, and literally a shitload more.
I could go on and on about the story but instead you should just check it out for yourself. You won't be dissapointed! Here is a link to the official site for the Comic Book:
http://www.wildstorm.com/minisites/loeg/loeg.html
If they movie is even half as fun as the comic then it should be pretty good!