Dimensional RP Suggestions!

For all of the people who responded to on of my RPs, "Medieval Quest!", you would know that Glitch has invented a dimensional transporting device. And if you haven't responded to the RP, then there you go. Now, I'm planning to make more RPs involving different Mobious dimensions, but right now, I'm having a hard time thinking of one. Then I decided that I'd give you all the chance to come up with your own ideas! Just answer below with the concept of the RP and the dimension it will take place in, along with some info about the dimension. Positive answers only! Thank you!