This reprint is a compilation of the contributions in the Special Issue "Acoustics, Soundscapes, and Sounds as Intangible Heritage". It gathers original research articles dealing with the acoustic and sonic aspects of a number of archaeological and historical sites worldwide. The authors confronted, and successfully navigated, several of the challenges inherent in the acoustical analysis of such spaces, employing diverse approaches and methodologies including spatial impulse response (IR) measurements and acoustic simulations based on finite-difference time-domain (FDTD) methods and geometrical acoustics (GA). This volume highlights the need for diverse and interdisciplinary approaches towards a comprehensive exploration of past sonic experiences. It places special emphasis on the methodologies and procedures needed, thus contributing to more rigorous research in the field while expanding our acoustical heritage.