Tokyo is the largest city in the world, hosting over 36 million people spread over 3 prefectures (districts). It is the capital-city of Japan and is officially known as the Tokyo Metropolis. Tokyo was formerly known as Edo in the 20th century. Tokyo is made up of 23 wards and 62 municipalities. There are more than a 100 colleges and universities in Tokyo. The Tokyo Skytree is the tallest free-standing tower in the world. Tokyo mixes the ultramodern and the traditional, from neon-lit skyscrapers to historic temples. The opulent Meiji Shinto Shrine is known for its towering gate and surrounding woods. The Imperial Palace sits amid large public gardens.