On visiting any historical place, a guide with complete knowledge of that place is required. So that he narrate the history of that place in detail. If you move without a guide you will not come to know anything about the place and you will not understand what you are seeing and what does it means. Guide answers all your questions and you can gain lot of knowledge from him. Many times it happens that we ignore small things, but always a small thing contains a big story, so only guide can educate us about the place.