Here are a couple of starters for you to investigate further.
https://en.wikipedia.org/wiki/Callanish_Stones
https://en.wikipedia.org/wiki/Castlerigg_stone_circle
If you change your mind about Stonehenge - get there as early as you possibly can to opening time to avoid the busloads that arrive from midmorning on.
Paul
PS I have been fortunate enough to have had the opportunity to visit all three.