(illustration above by Michæl Paukner)
This website says world wonders fall upon the curve of one great circle. If this is legit, my mind is blown.
The sites listed above are shown clockwise from Giza on the equal azimuthal projection below. The projection is centered on the axis point in southeastern Alaska. Distances to any location from the center of an equal azimuthal projection are equally scaled. Since all of the sites on the great circle alignment are equally distant from the axis point at one quarter of the circumference of the earth, the alignment forms a perfect circle halfway between the center and the outer edge of the projection.
Source: http://home.hiwaay.net/~jalison/