Near as I can tell both the extreme left (Stalin) and the extreme right (Sparta, no modern analogues exist) are authoritarian. Personal liberty can only exist between those extremes, in times of peace.
I agree with PoliticalCompass: one axis (authoritarian/libertarian) is not enough to pinpoint a political position, not even a meaningful approximation.
I took their test some years ago, and I remember where I was placed by it (well, more or less). I'll retake it soon, just to see if my position has changed.