Unit 23 Skatepark (Dumbarton): Unit 23 skatepark is the largest indoor skate park in the Uk and has been open since 2002. We are proudly rider owned and rider run which means our facilities are designed and built by people who use them daily! At 56,000 sq-ft we have ramps spread over 3 halls, that are designed to suit everyone and every skill level, including a massive replica of the legendary little devil bowl, The Uk's largest foam pit and a huge outdoor 3 and a half acre dirt jump / trails area.