Brothers Peter and Platon Chikhachev wrote many interesting pages in the history of not only geographical, but also historical, political and philosophical sciences. The study of Europe, Asia, Africa and America is associated with their names. While abroad for many years, they published their works outside of Russia. The author of the book is Professor V.V. Tsybulsky, who has studied the scientific heritage of the Chikhachevs for many years, visited Gorny Altai, Apennines, Turkey, North Africa, where Pyotr Chikhachev conducted research, translated from French and published many of his works, which are our national wealth. For a wide range of readers interested in the history of science.