In this book, the object of study are the circular morphostructures, which in the first half of the twentieth century were most often identified with various magmatic formations containing various mineral resources. The monograph treats one of the most topical problems of modern geology and geomorphology. For years, they were perceived as exotic objects or, at best, were identified with some magmatic formations - volcanoes and intrusions. With the development of space exploration, circular morphostructures have been observed both on the vast platform plains and orogenic massifs of the Earth, and on the surface of the planets of the terrestrial group.