Many people, after seeing mention of it on the geocacher bingo card at the Clarksville event were asking "what's an A.P.E. cache".
I was wrong about the ones in Chicago and Australia still being active. The only ones still active are in Sao Paolo Brazil and near Seattle Washington. The other 11 have gone to cache heaven.
Here is the Markwell link to Project A.P.E. Project A.P.E. Caches