Which books in the Goosebumps series feature Horrorland Theme Park?

Goosebumps, a series of horror fiction books for children, featured Horrorland Theme Park in the original series in book five, "One Day at Horrorland." A spinoff series called Goosebumps Horrorland was later created, based around Horrorland Theme Park.

Horrorland is run by creatures called Horrors. It is in an undisclosed location and contains rides and attractions such as a monster zoo, alligator swimming pond, vampire village, coffin cruise and a series of slides called the Deadly Doom Slide. The Goosebumps series, created by R.L. Stine, contains over 60 novels published between 1992 and 1997. The Goosebumps Horrorland series was created in 2008.