A 13km-long stretch of rock paintings was discovered at Serrania de la Lindosa in the Amazon rainforest, which depicts a variety of giant Ice Age creatures that are now extinct. Some of the fragments found in the ground beneath the painted rock date back to 12,600 years ago. According to scientists, this art represents the arrival of humans in South America. Although the topic is under debate, some archaeologists believe that early humans could have actually come face-to-face with giant animals of the past. These paintings could also help reveal what led these giant animals to extinction.