The i-adjective 遠{とお}い means far, distant. From what I know, I can make an adverb out of an i-adjective by replacing い with く, which should give me 遠く.
Now, the word 遠く is also a noun itself, which is interesting. This is nicely explained in this question.
Now, in the song Yume Sekai (ユメセカイ), by Haruka Tomatsu, we have:
遠くに聞こえた鐘の音が少し寂しくて
[...]
It looks like 遠くに is working as an adverb here. Is this correct? If this is the case, then can both 遠く and 遠くに be used as adverbs, with the same meaning?