Ancient astronaut theories suggest that intelligent extraterrestrials visited Earth in ancient times and had a significant impact on human civilization. Proponents of this theory believe that ancient documents, myths, and archaeological evidence contain clues to these extraterrestrial interactions. They suggest that advanced extraterrestrial civilizations provided early humans with knowledge, technology, and guidance, thereby contributing to the development of ancient civilizations and monumental architecture. This theory raises questions about the origin of human culture, the potential of ancient technology, and the role of extraterrestrial life in shaping human history.