I am trying to understand an oddly consistent behavior. I have two cats in my home that will "yowl" at a **very specific** point of the home, a small hallway leading back to a bathroom and bedroom (which we reserve for guests). I have no idea why. We don't really go to that part of the house very often (unless someone is visiting).

Is something wrong in that part of the home for them? Or perhaps they want us to follow? 

They were adopted as a bonded pair of sisters and appear to be primarily Bombay. They are approximately 1.5 years old if that makes a difference.