With the third park revealed, my three other parks I would include. 1) MedievalWorld. A difference from the film is that, I wouldn't have it happen in "Europe". Instead I would go with CrusadersWorld setting to have two cultures to crash and explore. 2) AncientWorld. As the above, I would add another culture to RomanWorld from the film and instead have it as PharaonsWorld in Egypt when Rome had it conquered. Alternatively, Alexander's time in Persia would work pretty well to. 3) FantasyWorld. Not necessary GoT, as tempting as it probably is for people at HBO. Rather closer to LotR and D&D. Magic would be tricky to include and it's a necessary aspect if this kind of world were to be popular with guests. Other fantasy world could be a SuperheroWorld. Like with magic, superpowers would be hard to do. In both cases it would be quite a challenge to make these worlds fit tonally with the rest of the series. Which, I suppose, could be fun for the writers if they wanted to do them.