Model railroads.

my favorite part of railroads was always building the scenery, the houses and such

for a while, my boy had a track to race cars on (cant think of the name, but you know the kids, two lanes, two controllers, gotta slow down in the curves or you fly off the track) i had some houses and stuff on that too, i liked it

come to think of it, there is one member who has a ridiculous layout for those cars as well
if i ever remember his name, ill let you know