“Sacred Echoes” explores the largely unexamined role of sound and acoustics in ancient religions, focusing on how auditory experiences shaped spiritual beliefs and practices. The book posits that sound was not merely an addition to rituals but a fundamental component in forging spiritual connections. For example, manipulating acoustics within sacred architecture allowed religious authorities to create awe-inspiring experiences and even induce altered states of consciousness, thereby solidifying their influence. The book uses evidence from archaeoacoustics, textual analysis, and cognitive neuroscience to reveal how ancient civilizations, including those of Greece, Egypt, and Mesopotamia, integrated sound into their religious systems. It considers the architectural acoustics of temples and the use of chanting and music in rituals. By presenting a holistic view that integrates archaeological data with scientific insights, “Sacred Echoes” offers a unique perspective on the auditory dimensions of religious experiences, often overlooked in traditional studies. The book progresses from introducing archaeoacoustics to examining specific cultural case studies, culminating in a discussion of sound's enduring impact on religious experience. By combining historical context with scientific analysis, the book invites readers to consider the profound influence of sound in shaping human belief and experience.