The evil countenance of Adilabad Qila, as far as I can tell Delhi's least visited fort.
Tughlaqabad, the former stronghold of the third dynasty of the Delhi Sultanate is a truly vast complex of ruins, most of which are rarely visited. Even the area's primary attraction, the citadel of Tughlaqabad Fort, is far from being at the top of the average tourist itinerary. I think that the main reason for this is simply that most ruins from the Tughluq period are much more functional than they are beautiful. They have a harsh, forbidding, and rather unlovable aspect to them, which is of course what makes them so interesting, but also means that they don't draw people in the same way that the grander Moghul constructions do. That being said, the Tughluqs have nonetheless left behind quite an extensive architectural legacy (along with spinning off a number of other important Islamic dynasties in India, such as the Bahmanids in the Deccan, who would go on to create a huge array of architectural works of their own.)
