The UN has one (you must be a national of a participating country), as do: the World Bank; Islamic Development Bank; Asia Development Bank; UNESCO; The UN; and The Commonwealth.
Competition for the YPP schemes is high and you would always be recommended to have a back-up plan. Think about the area in which you would like to specialise and look into gaining experience that will be relevant when applying to an international organisation in the future.
Many people who work for NGOs or international organisations establish themselves in a professional area first, before taking this experience into working for an NGO. Some areas valued by NGOs and international organisations include agriculture, forestry and fisheries, anthropology, economy roles, education, specialist engineers, environment, financial analytics, law, procurement, PR, public health, HR, IT, accounting, and administration. One tip is to build your career in one of these areas and then look to apply for a YPP or an experienced position with a development/ international organisation.