IMDB lists this as sci-fi (
http://www.imdb.com/title/tt0075491/), but I remember seeing this show as a kid and it scared the crap out of me then... I'm sure it could also classify as horror, although it has been 20 years since I've seen it.
I assume this was originally broadcast in the UK in the 1970s but I saw it when it was picked up by Nickelodeon and shown in the states in the early 80's as part of their sci-fi anthology series "The Third Eye". This show packed quite a punch for me and has left vivid memories in my head ever since then.
Although this show is aimed at children for its target audience, according to comments in IMDB it's still entertaining for adults.
I have been wanting to see this series again for years and it is now finally available on DVD! I didn't rip these myself, I just found them...
There were 7 episodes in all, here are the edk links:
children.of.the.stones.-.ep1.of.7.-.into.the.circle.avi
Children of the Stones - 2x7 - Circle of fear-1977.avi
Children Of The Stones - Ep3 Of 7 - Serpent In The Circle.avi
Children Of The Stones - Ep4 of 7 - Narrowing Circle.avi
Children.Of.The.Stones.-.Ep5.of.7.-.Charmed.Circle.avi
Children Of The Stones - Ep6 Of 7 - Squaring The Circle.avi
Children Of The Stones - Ep7 of 7 - Full Circle.avi[ Add all 7 links to your ed2k client ]