Miyazaki Ocean Dome
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The Ocean Dome - in Miyazaki, Japan - is known as the world's largest indoor water park measuring 300 metres in length, 100 metres in width and having a retractable roof. The air temperature is always kept around 30 degrees celsius. It is listed in the Guinness Book of World Records as the world's largest indoor water park.
Ocean Dome has its own flame-spitting volcano, crushed white marble "sand", and it also boasts the world's largest retractable roof, providing a permanently blue sky. Temperature, wind and humidity are closely controlled to provide an ultra-safe "sea-side" experience.
When the roof is closed, you still get blue sky and puffy white clouds.
Every hour, the volcano erupts and the hi-tech wave machines start up, starting a few minutes of sanitized surfing.
Entrance cost is about US $89 per adult and US $66 for children. The price is reduced for patrons of the Sheraton Seagaia Resort Hotel.