Naturally Musical Submarine Sea Organ

Located at a point of picturesque beauty on the Croatian coast sits the world’s largest organ – played by air moved through finely-tuned pipes by the sea itself. 35 concrete pipes create a variety of sounds that can be heard by passers by in a concert without end. The organ doubles as a set of stairs that provides visitors with a path down to the sea as they listen to the music of nature piped through the hollows below their feet. Click here for a larger diagram of how the organ works. (Source)