in question are on a sheer wall about 2,500 feet up and some claim they are Phoenician (Phoenicia existed from 2,500 BC to about 500 BC). It would be difficult to access with modern climbing equipment. Based on the sheer size of undeveloped areas of Central and South America and the thickness of the forest/jungle, there have to be a lot more things out there.
WikipediaPedra da Gávea is a mountain in Tijuca Forest, Rio de Janeiro, Brazil. Differential weathering on one side of the rock has created what is described as a stylized human face. Markings on another face of the rock have been described as an inscription. Some individuals, such as Bernardo de Azevedo da Silva Ramos, have advanced the position that the inscription is of Phoenician origin and possibly proof of pre-Columbian contact from Old World cultures. Alternative theories proposed include that the rock was the site of a Viking colony or that it is connected with suspected UFO activity.
https://en.wikipedia.org/wiki/Archaeological_interest_of_Pedra_da_G%C3%A1vea