Archaeoacoustics: the study of how one might recover sounds inadvertently recorded while a brush painted a canvas, or a stylus was working on clay. This may seem far-fetched, but some serious (or less serious) proposals have been floating around for a while. Check this site for a review of the hoaxes and real possibilities.
Other structures may be designed to create auditory effects, now or in the past. Check this article about it. Some examples are the steps in ancient American pyramids and some modern sculptures. Hear the chirped echo from an ancient temple in Teotihuacan, Mexico: