The Hradcany District is without a shadow of a doubt the most popular destination in Prague ,it's the Castle District ,the famous Prague Castle is one of the largest in the world but there's more to this district than just the castle ,there's innumerable palace buildings,great churches such as St Vitus Cathedral ,the architecture is so good ,red tiled buildings proliferate the district ,walking down the famous Nerudova Street is superb ,great building on both sides of this street,part of the castle complex takes in sections of Petrin Hill ,it's full of pubs,bars and restaurants and lots of retail outlets ,all in all it's a great area of the city to explore.