From the outside Agra Fort looks much like Red Fort, though it's actually older, much larger, and supposedly better preserved. We didn't go inside, mainly because I knew J and N only had a certain amount of patience of forts and some of the forts we'd visit later were higher on my list. Besides, we decided pretty quickly we didn't want to spend much more time in Agra than needed to see the Taj Mahal.
We got a better view of the fort from the south--this view is from the west--but since it was from a rickshaw, I didn't manage to take a picture.