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Read your post on borderpoint, not able to answer so fast there, so I will do it here. You mentioned the border in the Eurotunnel, "chunnel". I have seen it (the photo) too, but difficult to find it back on the net. Found an other one : http://www.mikegriggs.co.uk/images/border-tunnel.jpg
About the vertical borders: that house in Baarle IS interesting. Here are 2 photos: http://img64.imageshack.us/img64/6011/398s3sp.jpg
Ground floor is dutch , the rest "up" is belgium. Frontdoor rule, as you can see in 2e picture.
And your christmas puzzle: mmmmm I will come back to that one.