Part II of the Earth Chronicles deals with some of the most monumental buildings on the Earth (pyramids, Jupiter's temple at Baalbek, sacred city of Heliopolis...) and it also gives explanations, why (and by whom) these buildings were built. It makes sense, because it is really quite unexplainable, why have buildings that followed that time deteriorated that much in terms of quality and size. It is obvious that people have learned something from outside but after part of the knowledge was lost, they were not capable of surpassing their predecessors. Sitchin claims that Baalbek and Sinai peninsula were spaceports of Gods. Pyramids were designed for directioning of spaceships as for precise measurements of the planet. This also explains the fact that all great pyramids are not inscribed while newer are. This assumptions are given on the basis of studying ancient texts, especially Epic of Gilgamesh who was claimed to be of semidivine origin and wanted to join Gods in Immortallity, but was finally bitterly disappointed as he found out that he should be invited in the immortal club as it was fact with the Utnapishtim and that immortality cannot be gained. Reading is really fascinating, not too scholarly, but certainly not pure fiction. Highly recommendable.