Located in Miyazaki, Japan, the Seagaia Ocean Dome was the world’s largest Polynesia-themed indoor beach. It was a part of the Sheraton Seagaia Resort and measured 300 meters in length and 100 meters in width. The waterpark first opened in 1993, with visitor numbers peaking in 1995 at 1.25-million a year. Depending on the season, entrance fees averaged $30USD per adult and $20USD for children during its best year in 1995. Unfortunately, the Ocean Dome was officially closed on October 1, 2007 due to a renovation and partial re-branding of the resort. Continue reading for videos and more information.

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. The air temperature was always held at around 30 degrees Celsius (86 degrees Fahrenheit) and the water at around 28 (82 degrees Fahrenheit).