Greenwich Park boasts the honour of being the oldest enclosed Royal Park. Formerly a hunting ground for Henry VIII, the park still maintains a 13-acre grassland enclosure, which provides an urban sanctuary for deer, foxes and over 70 species of bird. One of the largest green spaces in south east London, Greenwich Park offers a wide range of facilities and points of interest, including a child-friendly boating lake, six tennis courts and the National Maritime Museum just on the perimeter. The Royal Observatory in Greenwich Park is home to the Greenwich Meridian Line which represents the prime meridian, relative to which world time is calculated and the distance to every place on Earth is measured. The views from the top of the hill across to Canary Wharf and beyond are spectacular, and well worth the trek.