A conjectural bird's eye view of the Citadel (Red Fort) of Shahjahanabad.
It can be seen that the citadel was entirely planned with right angle order.
The Lahore Gate is in the central foreground, the Delhi Gate is on the right end,
and on the upper left is Salimgarh connected by a bridge.
(From Gordon Sanderson "A Guide to the Buildings and Gardens, Delhi Fort", 1914, Delhi)