Cabin John Arch

Largest stone arch in the world, IMG:content-0663.jpg:[graphic] Cabin John Arch. IMG:content-0664.png:[blocks in formation] duct over the Cabin John Creek in Md. It is 220 ft. in span, 57 ft. rise, and 20 ft. high; the arch stones are 4 ft. thick at the center and 6 at the abutments.