The most important and beautiful part of the remnants of the Shahi Qila is the Zenana Hammam(bath). It is the perfect blend of styles inspired from both Mughal and Persian civilizations.
One can still notice the beautiful frescoes on the ceiling, which give it a very Persian look. An interesting piece of trivia here is that according the guides over here an image in the Zenana Hammam looks very similar to the Taj Mahal, and is considered to be a blue print of the phenomenal monument.