When I dream DF, I dream what the current goal of my fort would look like from the perspective of a dwarf, for example, a wide chasm, one side covered in windows, gently glowing from torches and fireplaces and stuff, while the whole chasm is criss-crossed by narrow bridges, into crude tunnels on the other side, escept for 4 imposing bridges, all made of enourmous microcline blocks. One is the main entrance, covered in grandeur, and flanked by battlements, siege equipment, a number of flood-gate closed pipes, etc. Another one, deeper down, if the access to the underground road network, which is more or less the same. The other two are large arches carrying aquaducts, one filled with foaming water, which exits the fort in a foaming waterfall in the distance, higher up than the tunnel enters the wall, and one carrying glowing magma, giving the entire subterranean chasm a red glow.
Oh, and there are a number of caves in the fort side, including forges that shower sparks all over the depths below, a magmafall somewhere, stuff like that.
A potential extra I just thought off are tamed giant cave swallows ridden by enslaved kobolds, patrolling the depths for tunneling invasions.