The city of Lisbon, Portugal, ranked as the happiest destination in the world for travelers, according to a study from BookRetreats, which offers packaged wellness vacations. That was thanks to its more than 2,800 hours of annual sunshine, expansive green spaces, and healthy restaurants throughout. In fact, the city was one of Travel + Leisure readers' favorite cities in Europe for 2025. Beyond Lisbon, the Finnish city of Helsinki ranked second after receiving the top score for low noise and light pollution. Known as the theme park capital of the world, Orlando, Florida, came in third on the list.