Modern and historical Christian churches are not the only place where you can find stained glass windows. In reality, the architectural style goes back to the time of the Romans and Egyptians.
However, tinted glasses only peaked in popularity in the Middle Ages.
Over time, it became a great picture form to show passages and saints from the Bible. Of course, kings were often exhibited in these artistic windows, the main purpose of which was to educate the illiterate masses to a large extent.
Since then, the Gothic architecture has died considerably despite several modern revivals. For example, here and there you will find numerous public icons, places of worship and stained glass windows privately owned.