I recently came across a fascinating article about an old concert hall, buried 40 feet below street level underneath a piano shop in Boston. You can read more about Steinert Hall here. There's a video walk through of the place on Vimeo, too - and it's VERY cool (if a little sad).  But yes, there's a point to this ... (listen to hear it). You can also click on the Episode Website link to follow the links I mention (and see the YouTube video).