http://www.youtube.com/watch?v=vURNhldkEss

This one is not as large as some, but I have to see it one day as it's one of my old stamping grounds in real life - Ambergate in Derbyshire. This layout has the lot - the old lime kilns, the Cromford Canal, the triangular station, the original station building which went many years ago. I've actually stood where the loco is at about 0.25!

A lot of the features depicted in this model have gone so it's a little historical document in its own right. For modellers over the pond, it's 4mm/ft scale, same as most British commercial models, but with the track gauge at 18.83mm instead of the incorrect 16.5mm which we Brits have endured since about 1930.