This research concerns the mystery as epistemological and aesthetic category. The objective of this paper is mystery as the particular form of conscious. The main target is the esthetical hypostasis of mystery and its role in art's evolution. Phenomenological conception of conscious by E. Husserl is the base of the research as the method. It is dedicated to phenomenological conception of conscious and we emphasize the intentionality is the most important issue of this conception. Subsequently we consider that the conscious is always intended on comprehension of mystery.The concrete mystery's characteristics as a particular form of conscious were explained as three basic aspects of conscious: emotional (affective), cognitive and axiological (based on works of V. Naidysh). The mystery is a result of its interaction. During the interaction of cognitive and axiological functions are acting aesthetical and rational types of achieving the mystery. Also we are considering the topic of religious and mystical (affective) conscious, their similarities and differences.This article also impacts the aesthetical aspect of mystery's determination and also mystery's expression in art. Artistic creation is a synthesis of high figurativeness and artistic imagination. The result of this synthesis is a work of art, which represents a special individual way of grasping the mystery.Furthermore we are analyzing forms of mystery's aesthetical performance in the history of art. The aesthetics of ancient Greece is discussing as born in an interaction of mythological and rational forms of antique culture.We should notice that in Romantic period the expression of mystery was at its zenith. The mystery in Romanticism is reflected by different artistic touches as addressing to mythological and biblical stories; also the slogan of romantics was “back to the mythology”. The irony, which provided to conquer the fear of mystery, had been creating the atmosphere of inevitability and unexplored (like the Lake poets), creating images of inspired nature, concentrating on the feelings of personality, etc.) Deep mysterious mood of romantic art is related to its leading ideological position: the desire for spiritual development of transcendental.