 With a length of 360 m ( 1 @,@ 181 @.@ 1 ft ) , the Limyra Bridge qualifies as the largest surviving engineering achievement of antiquity in Lycia . The bridge stands on 26 uniform segmental arches consisting of a double , radially laid course of bricks . At the eastern end , the original 27th arch has been replaced by two smaller , semicircular arches of later construction . The latter are built with a single course of bricks . Traces of the original , flat beginning of the collapsed arch are still visible on the piers . 
