Darkoth's Dark Castle (Nappa Valley)
Here is another interesting dark mansion. He cleaverly cheated his way around Borg Cube by adding some slants to the sides of the tower so it longer looks like a big cube

The layout of every room is well thought out and gives ample space for movement. I particularly like the little details he added to his decor. For instance, note how the head of the lich statuette on the pedestal of the entrance hall has been replaced by a golden skull. Note also how he made a design on the white vase beneath the white plant using a dead plant sticks. The only thing I might have done different is put the broken chair in the tinkering/carpentry/taioring room instead of the smithing room

That is one of the coolest fireplaces I have seen thus far. I have mixed feelings about the wooden floor though, especially considering the bear rug doesn't stick out enough, but overall, it's a pretty nifty room.
This laboratory/operating room is very neat. The hallway is also nicely designed though it is somewhat wasted space. Seeing how I am lazy, I would also hate having to go all the way around the hallway before I reach the door. But as far as aesthetics go, I give it too thumbs up.

And the roof. I have mixed feelings about the fences. While adding to the forebaring look of the tower, it also makes the roof look a little too busy. The temple area looks great, I would only add an Ankh.
