Shaniwar Wada, Pune

Shaniwar Wada in Pune is the most magnificent and stately mansion built chiefly as the residence of the Peshwas. The foundation of the original residence was laid by Bajirao - I in 1730 A.D. and the construction completed in 1732 A.D. His successors made several additions such as fortification walls, with bastions and gates, court halls and other buildings, fountains and reservoirs in 1828 A.D.
However, fire gutted the building in this place and what now remains is their plinths and fortification wall with five gateways and nine bastions that enclosed the whole complex. Nobody knows what caused the fire. The complex had an impressive lotus-shaped fountain in the garden. The location of this can be seen in the below image (the central part near the green cover where no people are present).
The main gate of the complex known as Dilli Darwaza faces north towards Delhi. This strongly built entrance has massive doors, large enough to admit elephants outfitted seating canopies. Each door has seventy-two sharp twelve-inch steel spikes arranged in a nine by eight grid which are at the height of elephants forehead. On the right door there is a small man-sized door for usual entries and exits.
The invading army can not charge through the open main gates as there is a sharp right turn followed by a sharp left before entering into the central complex. This would provide a defending army with another chance to attack the incoming army, and to launch a counterattack to recapture the gateway.

One of the brass canons with carvings on them in the complex.