A UNESCO World Heritage Site since 2007, Twyfelfontein has one of the largest concentrations of petroglyphs in the world, with over 2,500 engravings. Believed to be up to 2,000 years old, the sandstone engravings depict elephants, giraffe, lion, rhino, hunters and bizarrely, seals and penguins, providing insight into the life of ancient San. The hunter-gatherers who lived in the region created them as part of their rituals. Archaeologists have dug objects from two parts of the site including stone artefacts, pendants and beads. Twyfelfontein also contains six rock shelters containing depictions of humans painted in red ochre.