Many Victorian and Edwardian homes in the UK have glass panels above the front door (fanlights) that let people see in. You can add a house number or a decorative pattern using "Frosted" film cut to size by Tintfit: https://www.tintfit.com/ It adds a touch of class and privacy to the hallway. You can order the film pre-cut to the exact millimetre, making it incredibly easy to install yourself for a professional-looking entrance.