There are two air-worthy Lancasters left in the world. One of them lives 10 minutes from here, and we're lucky enough to see (and hear!) it all the time in the summer. The Canadian Warplane Heritage Museum is attached to the airport here, and is an amazing piece of history. I've taken our kids there a few times and always enjoy it.
One of the guides there is an old Scottish gentleman. I was remarking to him how terrifying it must have been to have heard one of the Lancasters overhead during the war. He said it was indeed - he was a young kid in Glasgow and very clearly remembers the sound of them.
http://www.warplane.com/