Although it had a reputation of being an industrial city, Cardiff has changed dramatically in recent decades. It is now a lively and modern capital city, gaining popularity with tourists interested in its history and in Welsh culture and is quickly becoming one of the United Kingdom's tourism hot spots. Summer is by far the best time to visit as the city hosts large festivals with al fresco dining and drinking becoming ever more popular due to large areas of pedestrianisation. The city centre has seen huge development over the last decade and is now considered one of the top ten shopping destinations in the United Kingdom.Cardiff is a very green city, having the most green space per person in the UK, and this is complemented by Bute Park which sits in the heart of the city. It has a reputation as a city of castles, having 5 different castles within its surroundings. The city's core population stands at roughly 345,000, with 860,000 living in the larger urban area.