The tower is just a quick and dirty model. I started with a mesh circle. This was extruded vertically, making an open cylinder. I then selected every other face, and extruded that without moving the position of the faces. The extruded faces were then scaled larger. Because the top and bottom were higher and lower than the original cylinder, I scaled them again vertically, so they became smaller height wise. Next I selected all the vertexes at the top of the cylinder's inside radius, and snapped the cursor to that center. I then selected one vertex on the top inner ring of the cylinder. This was extruded using the spin tool 90 degrees in the Front View port. I then switched to the Top View Port and used the spin tool again, 360 degrees. This gave me a dome on the top of the cylinder. Nest I moved the center rings of the dome up and arond to form the 'finial'. Finally, I duplicated the whole thing and moved it along the X axis to one side, scaled this smaller and moved it down to the base matched the base of the original tower. I then used Spin Duplicate to make copies of the duplicate tower.
I cut off the top of the center tower in the image to let the viewer's imagination do the rest of the tower. It;s the same as the smaller out towers. But you can image a neon sign flashing 'Castle Anthrax' if you like.
