I just stumbled across an article about a State Park in Austria called Green Lake. This article describes it better than I can, so read check it out!
Since I got my scuba diving certificate 2 years ago, I have yet to use it. So I think a trip to Austria this June before coming home is in order, don't you? If anyone is going to be in Europe during the beginning of June and is interested in going either just to check it out, or to scuba dive with me, let me know! I would love some company!
And here is another article with a cool video!