I went to this place called Bar Marsella in Barcelona a few years ago.
http://en.momondo.com/blogs/momondo/archive/2007/11/23/go-absinthe-barcelona.aspx
It was amazing, Picasso and Hemingway used to drink absinthe there. If ever in Barcelona, make sure to check it out! Not sure what the brand that they sold was, but it did the trick.