Mentioned by planetware.com
9 Best Parks in London | PlanetWare
"Hampstead Heath is a favorite for Londoners, a quiet oasis that provides the illusion of a countryside getaway within one of the world's busiest cities. This sprawling and irregularly shaped park is located north of the city center, just beyond The Regent's Park. Its best-known features are the three natural bathing ponds: one designated for males, another for females, and the third for anyone."