Spa World was one of two new parks, the other being Futureworld, at the Delos theme park in the 1976 movie Futureworld.
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The Delos Park in Futureworld is three times the size that it was in Westworld. During Futureworld, Westworld is closed and deserted.
Delos spent $1.5 billion in the two in-world years between Westworld and Futureworld replacing everything in Medieval World and Roman World, and building the new sections of Spa World and Futureworld. [1]