No trip to Dublin is complete without a tour of the Guinness Brewery. Once you enter, you begin to wind through the museum, where you learn about Sir Arthur Guinness, the brewing process, advertisements, distribution, and more. Upon finishing one room, you climb stairs to the next level to learn about a new subject. The multimedia displays are entertaining and sometimes even interactive. In the room about the brewing process, you can smell the ingredients at different stages of the process. At the top of the brewery, you can sample a free (after paying admission to the tour) pint of Guinness, the freshest in the world, while sitting in the Gravity Bar overlooking Dublin.