In the XVII-XVIII centuries. during the development of new districts, slums were demolished, wide streets were laid and squares were broken up. Frequent fires forced the townspeople to build houses of stone and brick. Glass was increasingly being inserted into the windows. Roofs covered with tiles began to come into fashion.
Ancient powerful walls have been preserved in European cities from the Middle Ages.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.