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I remember seeing this stone maze. Wasn't it on the Meseta somewhere? Was it actually a maze or just concentric circles?

If I remember right it is adjacent to the Cruz de Atapuerca between San Juan de Ortega and Bugos.

Yes Mike that's exactly where it its, the track goes to the left but there is another off to the right. When you look at it, it does cause one to consider "who had all that spare time to complete this display"?