daf bit: Shabbat 22
Today's daf discusses placement of the chanukiyah ("menorah", though technically that's a different multi-wick lamp). It was said in R. Tanhum's name: if the lamp is placed higher than 20 cubits from the ground it is invalid. (I have learned that this is because a lamp that high doesn't serve the function of publicizing the miracle -- who'll see it? The talmud doesn't address high-rise apartments.) Rabbah said the lamp should be placed within a hand-breadth of the door. On which side? R. Aha b. Raba said on the right; R. Shmuel of Difti said on the left. The halacha is on the left, so the lamp is on the left and the mezuzah is on the right. (22a)
Here in the US the norm is to place the chanukiyah inside the house (so it's visible through a window). In Israel I saw people use glass boxes that were placed outside next to the door. I don't know why this is done there but not here (so I asked).

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The g'mara here discusses fires caused by chaukiyot, by the way. :-) (Remember that at the time this was being written, all lights were flame, so if you had any street lighting at all you already had a fire risk.)