The thought of space aliens visiting Earth has long worried humanity. Archaeologists quite often find images of creatures similar to aliens on the frescoes of ancient temples. On the walls of Egyptian and Mexican pyramids, researchers have discovered mysterious inscriptions that probably tell about space aliens of the past and their role in the construction of ancient civilizations. India contains manuscripts detailing ancient aircraft. And in our time, the world media reports almost daily on numerous cases of observations of flights of unidentified flying objects. The next book in the series introduces readers to the 100 most amazing mysteries of ufology.