If you got the map with the game, you can see little red X's on the map.
Found out there locations of guardian stones.
The Lady {health and stamina regen} guardian stone is on the lake above Falreach ( the one with the stag emblem ).
Does anyone know any other guardian stones (besides the starting ones) and there effects?

The wiki has the locations and affects: http://www.uesp.net/wiki/Skyrim:Standing_Stones

Lovers is a little north west of Markarth, and increases all skills 15% faster

Ritual is a east of Whiterun, but I cant remember what it does (something to do with summoning I think)