The largest parks in the central area of London are three of the eight Royal Parks, namely Hyde Park and its neighbour Kensington Gardens in the west, and <answer>Regent's Park</answer> to the north. Hyde Park in particular is popular for sports and sometimes hosts open-air concerts. <answer>Regent's Park</answer> contains London Zoo, the world's oldest scientific zoo, and is near the tourist attraction of Madame Tussauds Wax Museum. Primrose Hill in the northern part of <answer>Regent's Park</answer> at 256 feet (78 m) is a popular spot to view the city skyline.
In which park is the London Zoo housed?
Regent's Park