You can tell that Alan Moore had a blast writing The League of Extraordinary Gentlemen. It takes place in an alternate universe where many of our most iconic and peculiar fictional characters (Mina (Murray) Harker, Allan Quatermain, Captain Nemo, Dr. Jeckyll, the invisible man, etc.) are real, and the aforementioned characters (along with a few others) have banded together in the late 19th century as the ultimate crime-fighting team.

It's a fantastic romp through a lot of literature I haven't read, but it's great fun — probably moreso if you've read the source material.