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 o 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.)