The walls in Chefchaouen were introduced by Jewish refugees in 1930. The blue walls symbolise the sky and heaven.

Photo: Bored panda

Blue Morocco. Photo: Miguel Michán / Flickr

Chefchaouen. Photo: Earth Porm

Photo: Earth Porm

Photo: Earth Porm

Photo: Earth Porm

Photo: voyagevisuelle.tumblr.com

Photo: Earth Porm

Chefchaouen, Morocco. Photo: johnnyaris120/ Flickr

Selling on the stairs Chefchaouen, Morocco. Photo: by ehsankhan87

Marocco, Chefchaouen. Photo: Shutterstock

Photo: Earth Porm

Photo: Earth Porm

Blue city of Chefchaouen Morocco. Photo: Steven Olson .

Blue at Night. Photo: Brian Hammonds/ Getty Images

Photo: Beers & Beans