Knuffingen Airport is the eight and perhaps the most spectacular section from the worlds largest model railroad, "miniatur wunderland" in Hamburg, Germany. The section was completed in may 2011. Before this no one had made an operational model airport complete with airplanes taking off, landing and taxiing to and from the gates.
There is also a view backstage.

This video only shows a tiny fraction of the layout. You should visit the model railroad and see for yourself.