What is the fine-grained topic of the following text: The ancient city of Shiraz is the city of Love and Literature and the origin of first samples of Persian gardens is the unique example of hospitality and warmness of its people and bears many historical and ancient attractions and old cities of Persian Empire showing the glory of a nation such as Persepolis and Necropolis and Pasargadae. Only return the topic.
Historical and cultural significance of the ancient city of Shiraz.