In a northeast region of Brazil, close to the capital of Paraiba, lies the old city of Ingá, (on the banks of the river Inga.) There, location on the water is an archeological site, containing a mysterious monument called the Inga Stone. The great wall of gneiss's rock, dates to over 6,000 years, and is 46 meters long by 3,8 meter of height, and covered with figures and signs which meaning is unknown by the archaeologists and anthropologists that examined them. Some of these signs are astonishing, like a cross, a skull, a rose and a strange form that seems a jet aircraft. The origin of this rock engravings are controversial and some believe that they were made by unknown natives of the primitive South America. Some scientists have speculated that the elaborate forms and their orientation suggested a kind of document, like a hieroglyphically scripture. Some signs of Inga's Stone resemble to ancient runes, the writing method of the culture of the called - northern barbarians. No one knows how, by whom or for what motives the inscriptions were carved on the rock. Various sources have been identified, and there are many who argue that the Stone of Inga has Phoenician origin. Fr Ignatius Rolim, for example, professor of Theology, Greek and Latin, who lived in the nineteenth century, was one of the first defenders and promoters of these theses, making analogies between the symbols written on the stone of Inga and characters from Phoenician writing. The Austrian researcher, Ludwig Schwennhagen, in the early twentieth century, toured various parts of the Northeast' hinterlands [of Brazil] - studying traces of the supposed presence of Phoenicians in this region. Besides numerous articles, he came to write the book "Ancient History of Brazil," not only associating the inscriptions of Inga with the Phoenicians, but also with the demotic writing of Egypt. There is also a hypothesis that holds that the signs of Inga were extraterrestrial engineering work. The president of the Centro Paraibano de Ufologia, Claudio Quintans, suggested that an alien spacecraft landed in the region of the Inga Stone. Another researcher, Gilvan de Brito, in the book "Viagem ao Desconhecido" ("Journey to the Unknown"), says that on the Inga's Stone exist formulas of the production of quantum energy and even mathematical including equations that might indicate the distance between the Earth and the Moon. However, it was not possible to say conclusively - who the authors were of the signs and the meaning behind the sequence of signs on the monument.