 The first nine towers are 20 – 25 metres high . In all ten towers , the floors and stairs inside were made of wood , while external stairs were made of stone . Half of the towers ( 1 , 2 , 4 , 5 , 10 ) have all four sides and are completely made of stone , while the other half ( 3 , 6 , 7 , 8 , 9 ) lack the side facing the interior of the fort . 
