Recently I took my kids on a tour of Sydney airport run by a company called Airside Tarmac Tours (http://www.airsidetarmactours.com/) It was all very interesting stuff driving around in a bus inside the airport perimeter fence and seeing how Australia’s busiest airport works.
One thing that really amazed me was this car lot we drove past that had something like 100+ cars in it. As it turns out these cars are ones that have been abandoned at Sydney airport carparks by backpackers and the like. Basically these folks turn up from Europe or whatever, buy a car, drive it around Australia sightseeing then as they leave the country through Sydney airport just dump the car in the airport carpark. Every month the 100+ cars that are abandoned are sold off to car yards.