Inga Stone

The Ingá Stone (Pedra do Ingá in Portuguese) is located in the middle of the Ingá River near the small city of Ingá, 96 km from João Pessoa, in Paraíba State in the northeast of Brazil. The Ingá Stone is also called Itacoatiara do Ingá. The word Ita means stone in the Tupi language of the natives that lived in that area. It is a rock formation in gneiss which covers an area of approximately 250 m². Altogether primary, a vertical wall 46 meters long by 3.8 meters high, and adjacent areas, there are entries whose meanings are unknown. Several figures are carved in low relief in this set, suggesting the representation of animals, fruits, and human constellations like Orion and Milky Way.
It is composed of some basalt stones covered with symbols and glyphs undeciphered until now. Scholars think it was created by natives that lived in the area until the 18th century. Unfortunately, the site is under constant danger of being damaged beyond repair by scavengers of artifacts and vandals.
Most glyphs represent animals, fruits, humans, constellations, and other unrecognizable images.
More information on the English and Portuguese Wikipedia pages. The UNESCO World Heritage Convention page is [ Portuguese]. 
Category:Undeciphered inscriptions