There are museums in the Red Fort and the displays are impressive. I learnt a lot about India in times of war, see uniforms and the weapons they used, etc. Here’s a sneak peak!
However, the place is so stuffy and therefore warm, despite the winter weather! It was suffocating. You need to bring a fan or…just take pictures of everything and read when you’re free or something. Of course, that would mean you’ll miss part of the squeezing through the crowd and drowning in your own sweat experience!