The Silophone Project:

Located in Montréal's old port, Silo #5B-1 was built in 1958 and has been cited by Le Corbusier as a masterpiece of modern architecture. The elevator was used to store grain which came to Montréal by rail and departed by sea. Due to changes in the global grain market the elevator became obsolete and was closed in 1996. Since then it has remained empty and, for reasons of security, closed to the public. The structure, constructed entirely of reinforced concrete, is 200 metres long, 16 metres wide and approximately 45 metres at its highest point. The main section of the building is formed of approximately 115 vertical chambers, all 30 metres high and up to 8 metres in diameter. These tall parallel cylinders, whose form evokes the structure of an enormous organ, have exceptional acoustic properties: a stunning reverberation time of over 20 seconds. Anything played inside the Silo is euphonized, made beautiful, by the acoustics of the structure. All those who have entered have found it an overwhelming and unforgettable experience.

Don't forget to play the silophone. You can even upload your own sounds. It seems like I'm the only person playing it right now, which is a shame. Maybe there are more people during North American daytime.