Not really, but sort of. When you are on the roof in one of the houses with the chimneys, stand perpendicular with the chimney and the "fence" on the roof. Stand as close as you can to the fence, and then run and jump towards the chimney. You will be standing half on it, and half off. Just jump again into the chimney, and you will be inside of it. No spells or attacks can harm you while you are in there, so if you are standing on the roof moonfiring the innocent level 20s that walk by and you see an angry tier 3 mage coming to you, then just hop in the chimney and laugh at him
not too useful, but kind of cool. Oh yeah and to get out, you need to turn towards the corner, jump, and tap W. It may take a couple trys, but its possible. Happy darkshiring.