Thank you for your question!
What you are feeling are mainly 2 things:
1) Lack of noise
2) vibrations: Those places are for people to pray, meditate, connect with God, etc. That attitude brings certain vibrations.
Those vibrations help you to get in tune with silence in your mind, if even for a short time. A silent mind allows peace, which is our nature; to emerge.
As we grow in spirituality, we could bring that sense of peace anywhere at any time.