Delhi is a city full of history and most of what remains (in terms of architecture) currently dates back to the period after the Islamic invasion of India. These photos are an amalgamation of scenes from the Qutb Complex (made in 1192 AD by Qutb-ud-din Aibak, who built the complex by destroying (and incorporating) 27 Hindu and Jain temples among other pre-Islamic buildings), Humayun’s Tomb Complex (which has the tomb of the second Mughal Emperor Humayun. The tomb was completed in 1572 though Humayun died in 1556), and the Red Fort (which housed the Mughal emperors and served as their palace from its completion in 1648 until the rise of British rule in India in 1857).
Note that all three sites are currently UNESCO World Heritage Sites. The photos (all of which were taken by me) are alternate perspectives of these very-frequently photographed sites.