The discovery of human footprints alongside dinosaur fossils in the banks of the Brazos River in Texas, as well as the finding of 2-billion-year-old metallic spheres in South African gold mines, has sparked significant interest among scientists regarding early human civilization. The massive stone blocks and precisely crafted stones of the Inca fortress of Sacsayhuamán are particularly astonishing. These stones are finely processed and fit together tightly, making it hard to imagine how such feats were accomplished thousands of years ago. Experts speculate that advanced tools and techniques may have been required, and there might even have been extraterrestrial intelligence involved.