RolePlayez :3

Your fc/s is/are in school at the end of the day, but as they're leaving, they see a glowing from a row of history classrooms. They look through a window one of them has, and they see a portal. They see they're all portals, leading to who knows where or when. There's four of them.
What do they do? O.o
(It be based upon Rawrmonster123's time machine RP. Credit goes mainly to her.)