High Quality Content by WIKIPEDIA articles! Valhalla is one of the flagship rides at the UK theme park Pleasure Beach Blackpool, it was opened on June 14, 2000 at a cost of Pds. 15 million GBP (the most expensive water ride to be built in the world at that time) and from then until this day has remained that largest indoor dark ride in the world. It is based on Norse mythology and covers 16 different scenes. The ride is laden with special effects and incorporates fire, water, snow, thunder and lightning effects with riders experiencing extremes of temperature from -20°C to 40°C.