Rosslyn chapel near Edinburgh is a very magical building, not least because I was married there, oh and some famous book and film was set there apparently! However a 600 year old piece of music has (maybe) been discovered encoded into the arches of the building, by a father and son team. There will be a recital of the music in Rosslyn chapel itself in a few days time. See Stuart and Tommy Mitchell’s website for details and to listen to the music they discovered.
Architecture of course a kind of encoding of information into a physical form, but its usually one way, the building itself is a product of explicit codes like the local building code for example and implicit codes, like a cultural value encoded into the decoration of that building. The only modern equivalent of an explicit musical code encased into a building I can think of would be La Tourette by Corbusier who worked with Iannis Xenakis and who may have encoded music into the window fenestration there.