Geauga Lake in Aurora, OH. Sadly, no longer there, but you can see lots of photos online of the abandoned park. The park opened in 1887 as a picnic spot, but grew into a theme park. We lived pretty much right across the street from it, and on the other side was Sea World (also no longer there). Through the early 2000’s it changed hands multiple times and eventually went defunct. We spent many a summer there, I went on my first roller coaster there too - the Big Dipper - which was unsafe enough at that time that I remember standing up from the seat with the downhill drops, and crying for my mommy the first time, lol. I also remember my grandmother telling me that someone had their leg torn off on one of the spinning rides there, though I never researched it to verify.
Here’s a Youtube video of a short history of the park: YouTube