Barrel House Distilling in Lexington, Kentucky. They produce a high quality vodka, a couple of rums (the oak aged golden is very good), a "moonshine" un-aged corn whiskey and they have just started releasing bourbon in very small quantities. They were out of Bourbon when I was there last weekend.
The distillery is located in a building that was a major distillery that never really recovered after prohibition. The tour is fun and simple. The entire operation is in one building, just three rooms. You can get up close and personal with the process and the people. They offer tasting and sales.