The document lists the top 10 happiest cities in the world according to a survey conducted by Simon Anholt. Rio de Janeiro, Brazil was ranked as the happiest city due to its association with dancing and celebrations like Carnaval. Sydney, Australia and Barcelona, Spain rounded out the top three, known for their friendly cultures and iconic landmarks. Overall, cities were considered happy if they were associated with aspects of culture, nature, and leisure that portrayed an enjoyable lifestyle.