Oslo is one of the world's largest capitals in terms of area but only 20 percent of this land mass has been developed, the remainder consists of parks, protected forests, hills, and hundreds of lakes. Parks and open spaces are an integral part of Oslo's cityscape, and are easily accessible from almost anywhere in the city. The center is a joy to explore on foot thanks to the numerous pathways and trails connecting its public spaces, as well as its many pedestrian-friendly areas, including the city's main street, Karl Johans gate. Stretching from Oslo Central Station near the waterfront all the way up to the Royal Palace, this wide avenue passes many of Oslo's tourist attractions, including the palace, the National Theatre, the old university buildings and Oslo Cathedral. Regularly ranked one of the best cities in the world in which to live, Oslo boasts a rich cultural scene and is famous for its theatre, museums and galleries.