In several German railway stations, there are model railway layouts where children (and their parents) can play with after putting in a 1 Euro coin. The layouts are pretty large and offer a lot of interesting details. Do you know similar layouts in your city and would you spend a Euro for having such fun?
As you know I love to stroll around railway stations while waiting for the next connection. So I do at airports as well. At Frankfurt on Main Airport I came across this Cadillac Sedan (1956) which is an advertisement for two German museums about technology.