Hanan Pacha - The original builders - Megalithic Stonework

The Peruvian researcher, Gamarra, got to the conclusion there were at least three civilizations and each orbiting in different "days" and "years", hence gravity of the earth, density, amount of oxygen has been different. That would explain the gigantic size of dinousars, lifespan of ancient humans and many other related things. His son and this man Jan are following that research and this was also published in Graham Hancock's website.
The architecture suggest the generation of people who came after the original ones couldn't duplicate the achievments made with stone, including vitrification technique. The photos are impressive.