The Ruined Dwarven Tower is the ruined equivalent of Dwarven Towers. It has, like every Dwarven ruin, cracked Dwarven bricks here and there. There is also an other variant an "taken dwarven tower". It has gundabad stuff instead of dwarvish and and gundabad chieftain spawns at the top of the tower.
Interior
Basically, the interior is like the Dwarven Tower, but with cracked Dwarven Bricks, and holes in the wall and floor. It is completely deserted, but still has a functional gate.
The view from atop one of these towers.
 The Dwarves of Durin's Folk 
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Dwarf (Axe Thrower, Banner Bearer, Warrior)
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