A private room and outdoor seating is available year-round. Open since 1923, The Sink is Boulder’s oldest restaurant and is home to some of the best burgers and pizzas around. Not just known for their award-winning food, but also as one of the best places to visit because of the location and atmosphere. You’ll have to stop by and see why so many people, including numerous celebrities, have made The Sink a must-see joint when visiting Boulder, CO. Open Daily from 11AM-2AM, serving food until 10PM. The Sink also serves wings, reubens, mac-n-cheese, healthy salads, milkshakes and more! Off-site catering is also available.