The Seagaia Ocean Dome (シーガイアオーシャンドーム Shīgaia Ōshan Dōmu?), was one of the world’s largest Polynesia-themed indoor waterpark, located in Miyazaki, Miyazaki, Japan.
The Ocean Dome was officially closed on October 1, 2007 as part of a renovation and partial re-branding of the resort.
The Ocean Dome sported a fake flame-spitting volcano, artificial sand and the world’s largest retractable roof, which provided a permanently blue sky even on a rainy day.
Top photo via Some Amazing Facts on Facebook. Other photos from the Wikipedia article below.