The Rules of When on Google Earth are as follows:
Q: What is When on Google Earth?
A: It’s a game for archaeologists, or anybody else willing to have a go!
Q: How do you play it?
A: Simple, you try to identify the site in the picture.
Q: Who wins?
A: The first person to correctly identify the site, including its major period of occupation, wins the game.
Q: What does the winner get?
A: The winner gets bragging rights and the chance to host the next When on Google Earth on his/her own blog!
WOGE on facebook
When on Google Earth has its own Facebook group.