The ruins of old fortifications are still visible around the site.
"Fort" is the word used in India for all old fortifications.
However the modern square was added in the 1810s, when the old fortifications surrounding the town were removed.
The present fort was built in 1717, replacing the older fortifications.
It was part of the old fortifications which originally surrounded the palace.
So several new districts were founded around the city's perimeter, just outside the old fortifications.
The castle is built on the walls of older fortifications.
Either way, it would be the oldest military fortification known to exist in Manhattan.
Even the old fortifications which crown it are not built, but cut in the solid rock.
Interesting old fortifications occupy the highest part of the island.