Hampstead ( or ) is an area in north London, England. Lying 4 miles (6.4 km) northwest of Charing Cross, it extends from the A5 road (Roman Watling Street) to Hampstead Heath, a large, hilly expanse of parkland. The area forms the north-west part of the London Borough of Camden. Hampstead is known for its intellectual, liberal, artistic, musical and literary associations. It has some of the most expensive housing in the London area. Hampstead has more millionaires within its boundaries than any other area of the United Kingdom.