This is the three hundredth post on Horizons of Significance. Milestones encourage us to look backwards. We look at a span of time as having had a beginning, if not also an end, at least a comparison of that beginning with the present moment. What you see, looking at this screen are two identical images, the "Header" for this site used in various configurations throughout this run. It is a scene photographed in 2004 at Cabo São Vicente, the Southwestern tip of Portugal and of Europe. This was the spot where Prince Henry the Navigator, as he is known in English, O Infante Dom Henrique, in Portuguese, established a "school of navigation" there almost exactly six hundred years before this image was captured. As with so much common-knowledge this is a garbled account. This spot was his home base. Voyages of plunder and enslavement were planned and organized here, but there was no school.