Upside Down and Other Places at School

Pete's first day at school is turning out to be the most exciting day of his life. Despite what his older brother says about it, he still can't wait to go. Even before he gets there, Pete feels as if he's on an adventure. Once there, in his imagination, he doesn't think he's entering a school building at all. Pete believes he's someplace else. Can you figure out where Pete thinks he is?