Yuma Blythe Intaglios - Geoglyphs are difficult to date, so archaeologists have no way of knowing their age. Mohave and Quechan tribes say the human figures represent Mastamho, the Creator of Earth and all life. The animal figures represent Hatakulya, one of two mountain lions/persons who helped in the Creation. These intaglios are best viewed from the air.
The Baigong Pipes are an example of what paranormal enthusiasts refer to as "out of place artifacts", modern objects discovered in ancient surroundings. The Baigong Pipes are described as a sophisticated system of metal pipes, buried in geology in such a way that precludes the possibility of having been installed in modern times.