Stapelaar (?) is doing some really cool things at the Belville scale. I was particularly interested in this stone bridge:


They show step-by-step how they made it. First they built the basic framework with bricks/plates:

Then covered that with tiles:

They built up the road surface with 1x1 tiles on plates:

Notice that these plates all run across the width of the road with none running the length, which allowed them to curve the road surface over the framework:

and hold it into place:

I wonder if the curving surface would work better with a baseplate?
Other details that would be of interest in castle building are the spear fence and the arches over the windows offset by half a stud:

and all the great multicolor mottling, as seen in this stairway:

There's some really nice landscaping as well; particularly check out the little sandbars in the river.

Bruce