I live in the suburbs, so even though I think it's pretty quiet in my neighborhood, there's often a plane overhead, a leaf blower a block away or the faint sound of traffic in the distance. Typically I can tune it out. But I was recently in a rural area and realized with a shock that it was quiet enough that I could hear the leaves falling from the trees and landing around me. I shot a little video to capture the moment. The images aren't exciting. You may want to just close your eyes and listen.
If you're interested in just how prevalent noise pollution is today, check out Tom Ashbrook's conversation with sound ecologist Gordon Hempton.