An article in the latest Journal of the Acoustical Society of America made me aware of this rather cool thing. Vitthala Temple, located in Hampi, India, has 56 pillars designed to sound specific pitches when tapped. Here is a video demonstrating them:
These musical pillars are also called the SaReGaMa pillars. Sa Re Ga Ma are Classical Indian solfege syllables, used for learning the ragas. I can imagine using the whole temple to accompany great musical rituals.
Anish Kumar, T. Jayakumar, C. Babu Rao, Govind K. Sharma, K. V. Rajkumar, Baldev Raj, and P. Arundhati. (2008) "Nondestructive characterization of musical pillars of Mahamandapam of Vitthala Temple at Hampi, India" Journal of the Acoustical Society of America, 124/2, pp. 911-917.