The Kutab Minar, Iron Pillar and the Great Arches, Delhi.
The Quwwat ul Islam Mosque located in the Kutab complex is a magnificent ruin
The Kutab Minar is one of the most famous monuments in old Delhi. It was built at the end of the 12th century by the Turkic Muslim conqueror of North India, Qutab-ud-din Aibak. It is said to be the tallest brick minaret in the world at 240 feet in height.
Jadu Kissen's Archaeological Photographic Works of India at Kashmir Gate in Delhi was an early publisher of postcards. The firm had offices in Srinagar at one point as well, and was likely employed by the Archaeological Survey of India. They seem to have specialized in images of old buildings.