The United Nations World Tourism Organization (UNWTO), headquartered in Madrid, Spain, is a United Nations agency dealing with questions relating to tourism. It compiles the World Tourism Rankings. The World Tourism Organization is undoubtedly the most significant global body concerned with the collection and collation of statistical information on international tourism. This organization represents public sector tourism bodies from most countries in the world and the publication of its data makes possible comparisons of the flow and growth of tourism on a global scale.