The Strata publishing house offers readers a new book by the author of many popular science publications, archaeologist, historian and philosopher Andrei Burovsky. We know enough about the world so that we can evaluate “strange” finds and information that contradict generally accepted theory. According to everything we know, civilization can only be created by an intelligent being. It is impossible to imagine the existence of intelligent beings and civilizations in geological periods when there were no warm-blooded animals with large brains. However, there is a lot of evidence that there could have been some others before “our” civilization. What if, in parallel with us, a certain mysterious people lives on Earth, a remnant of pre-human civilization?..