This paper examines some conceptualizations of Japanese cosmologies and sacred spaces within the Buddhist tradition. It first outlines how spaces and landscapes were perceived before the arrival of Buddhism and then explores their subsequent transformation in the medieval period through the use of mandalas, which were used to bridge the gap between the earthly realm and the Other World. This is connection is exemplified through the Womb World represented in mandalas, that can still be symbolically accessed through a sensory experience at multiple temples even today. Such entrances to the Other World are marked not only by symbolic spatial boundaries but also by temporal thresholds, during calendrical rites and liminal times. These cosmologies continue to exert a lasting influence on contemporary society, as evident in the remnants of geomancy in urban planning and frequent inclusion of Other Worlds in Japanese literature and popular culture. On the basis of fieldwork findings and existing research, the author concludes that the Other World is still present in contemporary Japan, being experienced as proximate to, and intertwined with, everyday life.