Chefchaouen, a tiny town of northern Morocco is famous for two things-one, it bubbles with a rich history, has magnificent architecture and lively natural environment; and two, most buildings in the old town or medina have prominent, vivid blue color walls all over. But, the labyrinth medina-sector, like most other towns of the area, has white-washed buildings with a blend of Spanish and Moorish architecture. Reports say that Jewish refugees introduced this in 1930 believing that blue color signifies heaven and sky. The trend caught on, and many more believe that these colored walls serve to repel mosquitoes too. Now, the blue walls of the town have evolved into a tourist attraction.