There is no official location called the "Grand Canyon of Pennsylvania". It's possible you're thinking of a different location or a nickname given to a local canyon.

To help me find what you're looking for, could you tell me:

* What kind of canyon are you looking for? Is it a large canyon, a smaller gorge, or a specific type of geological feature?

* Where in Pennsylvania do you think it might be located? A region, town, or any other landmarks near it?

With more information, I can help you find the canyon you're interested in!