19th century Arab fort, Kilwa Kisiwani Island, UNESCO World Heritage Site, Tanzania, East Africa, Africa

19th century africa arab architecture blue sky castle color image copy space day east africa environment fort hillside historical landmark horizontal kilwa kisiwani island nature nobody outdoors photography ruins stone sunny tanzania travel travel destinations unesco unesco world heritage site world heritage site 1800's african color colour daytime eastern africa fortress hill historical history landmark negative space outside sky sunshine tanzanian white space