Private room and outdoor seating available. Open since 1923, The Sink is Boulder’s oldest restaurant and is home to some of the best burgers and pizzas around, but not just known as one of the best places to visit because of the food. 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, with a special late night menu from 10PM-1AM! Need a late night snack? The Sink serves up wings, slider, reubens, mac-n-cheese, chicken tenders, green chili fries and more! Off-Site Catering also available.