Is the Garden of Eden still on earth?

While the actual square footage of the boundaries of the Garden surely exist, the Bible makes no promise that it would remain intact until the kingdom.  We can think of no reason why it would need to be, as God could recreate it as needed – perhaps as a gift to Adam or a museum exhibit for mankind to walk through to learn what happened there.

We have a general idea where it was based on the Genesis description of the four rivers, but its purpose of housing our first parents is complete and likely it has long succumbed to the weeds.