Google Earth is amazing! I tried it recently after George Kopp mentioned it and was amazed at the detailed view if offered. One thing that is important to understand is that Google Earth is not Google Maps. Google Maps is a website and Google Earth is a program. You can download the program for free here: click here
Once You have Google Earth installed you can go to the PGT by entering this address in the “Fly to” field on the upper left side of the screen:
8945 County Road 431
New Bloomfield MO 65063
That will take you to the PGT Visitor Center. The detail when you zoom in is amazing.