Date of discovery: Oct 2017
Location of discovery: Puerto Rico, island of Mona
News supply: http://www.newsweek.com/puerto-rico-mona-island-cave-art-early-humans-civilization-696239

This face was found in an ancient cave on a tiny island of Mona at Puerto Rico. The massive circle on the middle exhibits an alien face, most likely a tall gray, much like the kind of alien in Fire in the Sky incident. If you take a look at the screenshot under from the film, which exhibits what Travis Walton noticed when he was kidnapped, then you will notice the straight impassive mouth matches the drawing above, and so does the form of its face and its eyes. Next to the circle I circled one other face, it seems to be human however the eyes are warn away, nonetheless the chin, jaw, mouth, nostril and hair stay. Absolute proof that people and aliens each explored this cave again in the 800-1,500 years in the past, and generally they left a drawing, and clearly, both an individual who has seen this ET, however I imagine that the alien itself seen the cave, entered, explored, and seen the drawings, so it drew its personal face on the wall to be included with the human drawings. Teamwork you would possibly say. 
Scott C. Waring