Blackpool Sandcastle is the largest indoor Waterpark in the country. It has a total of 18 rides and attractions, all within the same building at a tropical climate of 84 degrees. It is built on the site of the former South Shore Open Air Baths. In 2007 – 2008 the Sandcastle won the Large Visitor Attraction of the Year award as voted by the Lancashire and Blackpool Tourism Board Awards. It opened in June 1986 and was designed as an indoor seaside - the biggest in Europe.
Recent years have seen major investments to enhance the Sandcastle. It now has the Masterblaster, which is the longest indoor rollercoaster waterslide in the world, at a total of 250 metres in length. The Master blaster is also the world's first uphill water rollercoaster. High speed rafts are propelled down steep chasms and up inclines by means of water injection technology. The ride also goes out onto the promenade and returns into the Sandcastle again. Other attractions include: Treetops Watershoots, Thunderfalls Waterslide, HMS Thundersplash , and many more, as well as cafes, snackbars and a souvenir and novelty shop. The hyperzone contains two adrenaline thrill seeking slides: the Masteblaster and the Sidewinder, which is a vertical drop ride controlled by gravitational forces. It is the first white-knuckle Sidewinder in the world.