sort of on topic, while being off topic at the same time,….
Underground cistern in Washington state. This space has a 45second reverb decay cycle.
The image is also a link to some info about this space:
There are tracks of this cistern featured in this CD, by David Hykes. It is with the Harmonic Choir of harmonic overtone vocalists, a style most people know from Tuvan throat singing. The harmonic overtones create other-wordly inhuman-like tones. The reverb cycle of the cistern plays off of this extremely well. Well worth finding.
I guess that you're going to want a link or something to suggest what CD this is, ehh?