Strictly speaking, it's fantasy, but my favorites are the Harold Shea stories, by L. Sprague deCamp and Fletcher Pratt. Christopher Stasheff was inspired to write his Warlock stories by reading them, and even wrote later stories with deCamp in the 90s. For those who aren't familiar with the stories (the originals can be found in a collection called The Complete Compleat Enchanter), Harold Shea is a psychologist who, with the help of his peers, comes up with the idea that schizophrenics and delusionals aren't truly crazy, but are partially perceiving other worlds, and that if you can change your frame of reference mentally, you can perceive these other worlds as well. He builds a logic engine (called the "syllogismobile") and tries it out, and finds that he doesn't just perceive another world, but goes there. The first world he goes to is the Nine Worlds of Norse myth, and the rest of the stories have him hopping around the great fictions of the Western World (and later, the Eastern world, as Stasheff and deCamp throw him into Journey to the East in a later story). For those of you who like the transfictional multiverse idea, this is pretty much one of the original stories.
It's a bit dated these days, given that it was written in the 50s or late 60s, and some of the attitudes are a bit parochial, but I found them great fun when I was younger, and I think they age well.
Ebony the Black Dragon
http://ebony14.livejournal.com
"Good night, and may the Good Lord take a Viking to you."
It's a bit dated these days, given that it was written in the 50s or late 60s, and some of the attitudes are a bit parochial, but I found them great fun when I was younger, and I think they age well.
Ebony the Black Dragon
http://ebony14.livejournal.com
"Good night, and may the Good Lord take a Viking to you."