It's Ocean Dome,which located @ Japan!!
The roof is retractable.
When the roof is closed,u still get blue sky and puffy white clouds~yummy~
And the special thing is,Ocean Dome has its own flame-spitting volcano,crushed 'white mable sand'.and it also boast the worlds lagest retractable roof,proving a permanently blue sky!
So imagine where the sky is always blue..it's never too hot or cold,the water isnt filled wit pollution and the surf is always perfect..
BUT BUT BUT the entrance fees is US$50 per person,which seems especially expensive given tat there is a free,natural beach only 300metres away :D