Ok.. so where do they go?

Here's a discussion I started with the significant other this evening: You know how all those cars are built every year. Hundreds of thousands of new cars that sit on showroom floors and parking lots. Now we know that not all are sold. Even if it was as high as 50% being sold, what the heck happens to the remaining cars???

I mean think about it. There are about .. what? 5-7 major car manufacturers in North America/Japan alone. The big ones -- Ford and GM -- produce hundreds of thousands of cars each year, and with every new model, they last longer and longer. So, the cars that aren't sold. Where do they go?