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 the annual Carnaval festival and images of dancing into the dusk. Sydney, Australia and Barcelona, Spain rounded out the top three, with Sydney praised for its friendly locals and iconic opera house, and Barcelona noted for its culture, weather, and soccer team. Anholt suggests that cities are perceived as happier when associated with popular countries, cultures, and images.