These 95 monolithic stones were elaborately placed according to solar system and seasonal patterns in 5000 B.C. How did they know that back then? I am happy if I can find the Big Dipper! The drive to the megaliths was just as incredible as this sight: passing through olive, eucalyptus, and cork tree forests. The Portuguese let you walk right among the stones and touch them...a very different practice than many other countries' historical sites.