9. The Valley of Giants
Americans Eric Randall Morris and Galo Canizares designed this 1 kilometer tall multi-functional towers. These towers would be able to produce and collect water, as well as pollinate their surrounding landscape, turning barren land into a beautiful oasis. The plan is to use these structures in areas in which rain is rare and vegetation is non-existent, such as the desert areas of Africa. This specific structure is built to be located in Tindouf, Algeria.