In Central Asia, the most ancient Islamic monument is the mausoleum of Ismail Samani in Bukhara (900), the Kalyan minaret in Bukhara (1127). The buildings of the Timur era in Samarkand (about 1400) – the Gur-Emir and Shahi-Zinda mausoleums, three madrasahs on Registan square, the Bibi-Khanym mosque. Monuments in Khiva were built in the 18th-19th centuries. Other famous monuments are the al-Azhar mosque in Cairo (X century), the Umayyad mosque in Damascus, the Taj Mahal mausoleum in India (XVII century).
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.