Colombia
Map: What World's Largest Rock Engravings May Mean
The engravings are found in Venezuela and Colombia on rock faces along the Upper and Middle Orinoco River.
Researchers have uncovered fascinating new insights into the world's largest rock engravings, proposing that they may have been intended to mark territorial boundaries.
The pre-Hispanic (or pre-Columbian) engravings, whose precise age is unclear, alt... [4763 chars]