Grandpa Bill's Train Town

Growing up, my next door neighbor Hank Rose had a somewhat smaller version of this in his basement (he needed a lot of the space for handmade ships and airplanes!)

I spent a lot of time in that basement. :-)

Miniatur Wunderland -- largest model railway / railroad in the world

Growing up, my next-door neighbor had a similar set-up (a bit smaller). I spent many wonderful hours there as a child.