Can I still explore after I enter the End of the World in Kingdom Hearts 1?

One thing you can do if your not sure is do what i did. save it again. one in which you do go through to the End of the World and another where you left off. that way i can go play the End of the World as far as i want but can still play where i left off if i still wanted to. Or you can delete the End of the World file after you've explored it and play the original.