To see modern Egypt and Cairo it has now become important to visit the famous Tahrir Square -- which is really a huge round-about. Not a square at all. It is easy to get to by foot or train. A fascinating part of modern history and not in general as dangerous as one might think. Just pay close attention to the Embassy warnings and the news. Good to combine it with a visit to the Egyptian Antiquities Museum next door and then a walk across the bridge over the Nile to Zamalek.