The publication is based on commented translations of Old Irish narratives on the theme of sailing to Another World and visiting wonderful islands (the so-called Immrama). Autochthonous in origin, the theme is also projected on arrangements and interpretations in medieval Ireland of ancient subjects (legends about Ulysses and the Minotaur), translations of which are also presented in the publication. The monograph, in addition, gives translations of classical works about the islands of the Other World, as well as a number of modern domestic interpretations of this topic.