Phantasiastisch
Mega Poster
Particularly on the place where you predict the second attraction, there is already something being built atm. What it will be is not known yet.The second attraction (blue marked area) could be anything. It's not even sure if there will be a second attraction but due to the fact that Phantasialand has limited space, that seems to be a logical step for 2022 or later.
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However, I do think a replacement of the employees building to something related to the visitors is not unthinkable. But this would be something in the future after all other projects when the rest of the park is completely up to date and when they finally got the chance to expand the park (so the employees building is getting built somewhere else).