From historical records, art and ancient texts, it would appear that Extraterrestrials and Advanced Intelligences have been coming to Earth for thousands of years.  This may be explained by their ability to time travel and “manage” certain time events. In addition to time management events, some of the beings are believed to have incredibly long life spans, upwards of three to four hundred years. Having the technological ability to time travel, “planet hop,” and utilize specific types of space, vortexes, dimensional dualities, coupled with having an exceedingly long lifespan and other biological advances, both genetic and technologic, might potentially solve the riddle as to why our ancestors saw these beings and their craft in our skies thousands of years ago. Ancient texts and art in many forms and from cultures all across our planet depict the Extraterrestrial presence penetrating deep into our Human past.
These images represent petroglyphs dating back thousands of years ago made by Native Americans in the American Southwest. According to their folklore, two objects collided high in the sky and one crash-landed in the region of Death Valley. Some beings arrived in another ship and spent some time repairing the damaged craft and were observed by the local peoples. The two images below may possibly depict the ship (left) used by the beings who came to repair the damaged craft. In comparing the two images, the one on the right seems to depict structural damage around the edges and the bottom.
This painting is called "The Madonna with Saint Giovannino". It was painted in the 15th century by Domenico Ghirlandaio (1449-1494). Above Mary's right shoulder is a disk shaped object. Below is a blow up of this section and a man-- his dog can clearly be seen looking up at the object. It seems likely that the UFO depicted in this painting was responsible for monitoring events on Earth.
These ancient lines found in modern-day Peru have geometric clarity that is impossible to achieve today. It seems likely that they were built as landing strips for ancient spacecraft.Some drawings, especially the early ones, were made by removing the stones and gravel from their contours and in this way the figures stood out in high relief. The concentration and juxtaposition of the lines and drawings leave no doubt that they required intensive long-term labor as is demonstrated by the stylistic continuity of the designs, which clearly correspond to the different stages of cultural changes.