 If you liked
Sirius
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 ...then you might like
Yuukoku no Moriarty
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These two have very similar moods and settings, despite the differences in world lore and story. They are set in very Victorian/Gothic cities with a nearly steampunk feel to it (without the fancy gadgets though). They are full of edgy characters, drama, confrontations, and two sides that are both somewhat sympathetic from a viewer perspective. They cover some similar themes of morality and revenge. If you watched one and are craving that slightly goofy dark Victorian drama, the other might just scratch that itch. Just bear in mind that Sirius is largely about supernatural races, Moriarty is certainly not.