Girl Genius is a gaslamp fantasy set in an alternate Victorian era with Adventure, romance, and MAD SCIENCE! MWAHAHAHAHA!!!
Written and drawn by Phil and Kaja Foglio, Girl Genius is an excellent webcomic with ridiculously engaging stories (I stayed up till 4 in the morning the first night I read it) and great characters.
The titular Girl Genius is Agatha Heterodyne, originally a struggling student turned into potential savior of their world when the Other comes back.
Plus, there's some wayward clanks, constructs, princes, barons, lost princesses, and many more to keep you engaged and entertained as you read.
Find it at: http://www.girlgeniusonline.com/comic.php