If they don't say anything to you don't be offended and don't feel obliged to make small talk yourself. Instead take the time to absorb the conditions of the environment that you find yourself in. If you are walking through an area where there are a lot of people working, this is an ideal opportunity to sample your likely working environment. Look at and listen to what is going on. How does what you perceive compare to what you were expecting and what you are used to?
If you are instead shepherded through quiet corridors to a solitary interview room, there are still pointers to look out for. Dedicated interview rooms sometimes serve as meeting rooms. Rooms like these are usually far better maintained than the environment that you will be working in. As a rule of thumb, whatever the state of the interview room, you can expect your working area to be of a lesser standard.
The personalities of the type of people that work for the company can be evident in these rooms even if no one is present. If the room looks like a bomb hit it then that can tell you something about the people that work there.
Remember that you are also investigating whether this potential employer is worthy of a significant portion of your working life. Whatever your observations may be, you are ultimately the sole judge of whether you would find this acceptable in your daily working life.