Adding Detail to the Arch

I added resolution to the archway under the window with the insert edge loop and then I used the interactive split tool to draw in edges where I wanted my first crack to appear. I then selected the faces of my crack and pushed them in the Z axis.

I added some edges to the left of the window so I had more points to draw the second crack on and then using the interactive split tool I drew my second crack. I selected the faces of the crack and extruded them in ward in the Z axis.

I selected the column of corner blocks on the front building, combined them and made a duplicate of them. I rotated the duplicate so that it lay horizontally, scaled it down slightly, and lined the blocks up with the left side of the arch. I made duplicate of the blocks and moved it to the side of the first set of blocks so that it reached completely across the arch and I also combined both lines of blocks into one. Under the animation tab I went to create deformers>nonlinear>bend and I rotated the resulting deformer 90 degrees in the X axis so that it lay horizontal to the blocks. I then rotated it in the Z axis 90 degrees so that when I adjusted the curvature it would make a vertical arch. I set the curvature to -.5 and lined the blocks up with the arch. I duplicated the blocks to and moved them to the other side and adjusted them to line up with the arch.

I created a pipe, set the divisions to 12 and then deleted the bottom 6 divisions so I had a half pipe. I added some resolution to the pipe and then made a duplicate of it, rotating the duplicate 180 degrees. I adjusted the two halves so that they were interlocking and then combined them. I created a nonlinear bend deformer. After adjusting the curve of the pipes to the roof I used duplicate special to make multiple copies.