Headquartered east of Midtown Manhattan, the United Nations was founded in 1945 after the end of World War II to replace the League of Nations in stopping the war and providing a platform for dialogue among nations. Visiting the United Nations is free but requires advance booking of the time and language choices to attend the tourists'group. The Chinese group is the most difficult to make an appointment. You can also buy tickets to choose different special tour groups, especially an English group for children, so that adults and children can have a deeper understanding and experience, recommendation! It takes about 3-4 hours. At the end of the day, you can also send your business card at the post office of the United Nations.