This is something that annoyed me since I started playing. does anyone else feel like the ancient nordic towers have a flawed design? I'm no architect but I think that a tower with narrow base and wide top is fated to fall, be it by siege weapons, natural disasters or even tongues fus ro dahing at them.
A few examples:
http://img1.wikia.nocookie.net/__cb20121114233249/elderscrolls/images/0/0f/Nilheim.png
http://img1.wikia.nocookie.net/__cb20120117222816/elderscrolls/images/2/28/TESV_Bannermist_Tower.png
http://img4.wikia.nocookie.net/__cb20111117182623/elderscrolls/images/8/8b/Valtheim_Towers.jpg