hebe, i understand you like to challenge yourself and not look for locations that are easy/more famous. but i suggest you still look for the "easy" locations because they are still very interesting to all of us, and it will be a lot easier for you! do both the easy locations and the hard locations!
Sometimes I see the buildings in HK and I think they are not new, but perhaps not so old. Hard to believe many of these buildings are 40+ years now... some of the older tenement-type buildings in Mong Kok or Sham Shui Po must be almost 80 years old now!