you mean Roller Coaster Tycoon and it has 2 sequels that aren't too old.I used to love playing this game when I was a kid.
I love Rollercoaster Tycoon, both the first and second ones. If I had the time, I would play them again.
the third one is okay, but I prefer the isometric view of the first two.
It is too bad that atari and the original creator of the Tycoon series (Chris Sawyer) had problems with ownership of RCT3 because now they won't be releasing a new series to the tycoon family. I really enjoyed playing roller coaster tycoon 3 but it had way too many FPS problems. It would lag so bad when a park was too big. I hope that someday they release a new and faster version of RCT3.