Still in operation, the world's first pay-one-price theme park opened in this U.S. state in 1961
[DOC] [TLE] Disneyland Timeline - California State University, Sacramento [PAR] 1958  The first poster-sized, large souvenir map of Disneyland is released to the 
public ... for one low cover charge of $2.50 (the POP also stood for Pay One Price
).