Relativity Falls ("Inverted")

Stanley and Stanford Pines are sent to their great uncle Dipper's cabin in Gravity Falls, Oregon for the summer. While there, Stanford finds an old journal with a shooting star and the number 3 on the front hidden in the forest. Inside are entries and polaroids about the strange things that are in Gravity Falls (as well as traces of glitter).

The journal also seems to have mysteries revolving around itself. Like who wrote it? What happened to them? What were the seemingly missing pages about? Where are the other journals?

Mystery doesn't just follow the journal, for it seems to also follow their Grunkle, a surprisingly smart man who turned his house into a tourist trap to earn a quick buck, but he seems a bit more honest than the Pines twins thought he'd be, and they know little to nothing about his life before the Mystery Shack. What's he really hiding?...

I do not own Gravity Falls, nor do I own any of the characters here (except for any characters that weren't in the original show)

(Heyy, author here. I liked the idea of Relativity Falls, and I also saw a couple posts where it was Mabel who went into the portal instead of Dipper, so here we are :] )