Three levels of fairground:
- the street level showing the destruction after the appearance of the vampire and subsequent panic. Entrance to the Ghost Train on the right.
- the Ghost Train interior
- the "power level". Here is where the Ogre-driven mechansims are that drive the rides etc.

Of course there was no vampire - it was just the caretaker (who is an illusionist) scaring everyone so he can sell the land.

Yes, it's the Scooby-Doo plot.... :)