As I said, I’m fascinated by ancient world and may a bit biased here,
but for me, one of the best places in Cairo is the Museum of Egyptian Antiquities with a rich collection of items from ancient Egypt.
Cairo is a large city with many diverse areas.
Depending which part of the city you visit, you may think Cairo is poor, crowded, old, modern, polluted, etc. Even some of the above adjectives are not really positive; Cairo is worth visiting!