I'm sure you've all heard of or even used Google Earth. Today I came across an amazing kml file that plays sound recordings from around the world! It's from Wild Sanctuary: The Voice of the Natural World.
You can download the kml file to use with Google Earth, but you can even see and hear the content in Google Maps!
There are a lot of nature sounds, but they've even captured the cacophony of major cities like Chicago or New York city.
Check it out at: http://earth.wildsanctuary.com/