It’s a giant indoor ski/snowboarding slope, with year-round snow.
Nope, not BigAir Fukuoka in Japan.
Nope, not SkiDubai in the Middle East.
Nope, not SnowPlanet in Auckland, New Zealand.
It’s SnowWorld in Landgraaf, the Netherlands.
That’s right; the Dutch are the ones running the world’s largest indoor ski area.