Sometimes, I see abandoned houses and I think... Aww, that place was probably sweet in its day. Not this one.
Also I thought there was a dog in #3. O.o
I'm glad you braved the bad air to check it out and share with us. Did you find evidence of why it smelled so bad, even in the cold? One of the last houses I was in had the entire kitchen sink full of raccoon shit from which and pretty spectacular mold was growing.