Scharffen Berger chocolate factory in Berkeley, California, and took a few pictures. This is a highly recommended trip; the tour is free, and you get to sample cacao beans from around the world, then walk through the factory - past the beautiful red roaster and the assembly line.
The factory is an old brick building in downtown Berkeley - it used to be a Heinz ketchup factory. You can smell the sweet chocolate from a block away.
You can sign up for a free tour at Scharffen Berger's tour website.