This map is a part of an atlas known as the Queen Mary Atlas. Queen Mary commissioned the atlas in 1558 from the Portuguese mapmaker Diego Homen. Mary died before the atlas was finished, and after her death, the atlas was presented to Queen Elizabeth I.
Megaliths on the earth seem to be related to each other, built along a "grid" composed of two pentagrams within the circle of the equator. All the monuments fall into place along this grid if one pentagram is "anchored" at Giza one at the Prime Meridian 0 longitude. Too many major architectural structures exist along this dual-pentagram design for it to be mere coincidence. This design predicts where megalithic structures will be found, as well.