Best places to visit on Second Life for educational purposes

There is a site already on the Best in Second Life and I have used the best of the best in terms of education. However I am adding to add to this list as I continue to find other beautiful places. See also an annotated flickr show of wonderful places on second life.

You may also view my own flickr shows with the best of second life:

What to visit:

Groups on Second Life [the good and the bad]