The Loire Valley in France is known for its many castles from the 15th and 16th centuries when it was a popular place for French kings to build country residences. Some of the notable castles mentioned are Amboise, which contains Leonardo da Vinci's tomb, Chenonceau which spans a river and was occupied by rival wives of King Henri II, and Chambord which is the largest with over 400 rooms. The document also discusses the Palace of Versailles built by Louis XIV southwest of Paris on 250 acres with over 20,000 residents at its peak.