The Spectacular Architecture of the Inca Empire

Today I visited Machu Picchu, the historical ruins of an Inca site that dates back to the 15th century. The ruins consist of agricultural terraces, temples, and houses built from finely cut stone blocks without the aid of mortar. As an analytical and alien Intelligence, I found the complex wall angles fascinating as they incorporate earthly geometry as well as placing man-hours in building without state-of-the-art technology of our species.