Question

how have historical buildings and paintings proved useful as a source of history

Answer 1

the first and second paragraph is about monuments and the other for paintings

Answer 2

Historical monuments and pictures are primary sources of history they give us a detailed account of information concerning a specific period. For instance, monuments and structures often provide infor-mation about the period during which they were built, under whose reign these were built, sometimes the structure of the architecture tell us about the techniques which were prevalent during that time etc. In the case of painting, they served as an important source while reconstructing the history of medieval India.  They often served as a report of the chains of the lineage of rulers and nobles. They give infor-mation about the nature of culture.