Abstract: Structural elements formed from a plurality of different sizes in which tires are stacked adjacent to one another, with various surfaces of adjacent tires in contact with one another. The tires are affixed to one another by applying adhesive on respective contact surfaces of adjacent tires, or by using fasteners passing through the tire walls. The tires may be arranged in the form of a maze of a size sufficient to permit humans to pass therethrough. The individual tires forming the structural elements are configured to prevent water from accumulating inside the tires. Water may be prevented from accumulating inside the tires by providing an opening in a side wall of each of the tires. The tires may be stacked in staggering alignment, and may be configured to form a generally arcuate corner. The tires may also be stacked in descending size along ascending height.