Basically as the title suggest, I am looking for a steampunk or even a alternate history type of series that are for adults. If there is any books that are not part of a series please still throw them at me. I'm trying to break away from the fantasy genre for awhile and needing another genre of books to read. Thanks in advance.
China Mieville is a fantastic author who writes in the "New Weird" genre (whatever that means). Three of his novels in particular (Perdido Street Station, The Scar, and Iron Council) strike me as a mix of science fiction and fantasy--they're all set in the same story-universe of Bas-Lag, which has some steampunk elements.
But if you want the real deal, I'd look at Mervyn Peake's Titus series. Peake was a British author who influenced Mieville writing and is (rightly, I think) called the grandfather of steampunk. His novels Titus Groan, Gormenghast, and Titus Alone are my absolute favorite books of all time--steampunk technology, an outdated social system, and a sort of comedy of manners.
I'm probably making all of these books sound more boring than they are, but that's my fault--not Mieville or Peake's. The worlds they built have a steampunk flavor to them, but they're so unique and utterly bizarre that there's nothing like them in any other book. I couldn't recommend them highly enough. :)
Another Kindle book not available for European customers. Now I have to deal with kindle books, which are either not available at all, not available to me or are way to expensive. It probably takes a few more years until this is sorted.
Baen books has a series of alternate history books, brainchild of Eric Flint but he lets lots of other writers play in his sandbox. It begins with '1632', which is the year a modern West Virginia town winds up in the middle of Germany in the middle of the 30 Years War. It's a great series and at least the first book is available as a free download from the Free Library on Baen.com
At the risk of a shameless self-plug, you might try looking into my Displaced Detective series if you like SF and mystery. It involves alternate realities and such. It isn't steampunk (although I just finished a steampunk that's looking for a home), but it has Victorian scenes and such.
I write an adult steampunk series starring Detective Pat O'Malley, a Civil War vet who fights the Steampunk underworld of post-war New York City. You can check out the series web site at: http://www.contempinstruct.com/Forevermore