"Benvenuti nel Paese Azzurro," reads the sign on a blue bicycle in a lovely Italian town in Puglia, Italy. It means, "Welcome to the Blue Country," and it's there for a great reason. The town is Casamassima, and a good number of the buildings here are painted a pretty blue color. There are different shades, and everywhere you look, this soothing color adorns the walls, the balconies, the flower pots, and more. 

As it turns out, there are several versions of the local legend of why the color is there in the first place. One of them even has a bit of a scientific basis, believe it or not. In addition to being one of the most scenic towns in Italy for that perfect social media shot, it's also quiet as far as tourism goes.