Gwalior is a historic city in central India's Madhya Pradesh state. The document provides details about Gwalior's location, history, and important architectural sites. It notes that Gwalior Fort, situated on a hilltop, has been ruled by several dynasties and contains palaces, temples, and other monuments showcasing different architectural styles. Some of the most significant sites mentioned include the Gwalior Fort, Gujari Mahal palace converted to a museum, the Sas-Bahu temples, and the tombs of Tansen and Muhammad Ghaus.