Regent's Park is a huge, thriving green expanse in the heart of the capital consisting of two circular areas (an Inner and Outer Circle). At one-time a hunting ground for the ever-ebullient Henry VIII, the Prince Regent (later King George IV) commissioned royal architect John Nash to transform the land in the early 19th century. Now most famously associated with London Zoo - positioned over on the north-east corner of the park - an open-air theatre, ornate bandstand, large boating lake, huge mosque and 100-acre sports field add to its many attractions. The rest of its 395 acres consist of vast open parkland interspersed with formal, landscaped gardens. Dating back to the 1930s, Queen Mary's Gardens are still regularly and fastidiously tended, while the rose gardens burst at the seams with over 30,000 flowers. A number of pretty eateries also populate the park, while Primrose Hill (to the north) is heaving with trendy cafes and bars, not to mention some fantastic views over Westminster and the City. A worthy attraction in itself, if you're visiting the zoo or theatre, make sure you take a couple of hours out to explore this elegant park.