Enlisted personnel are identified by way of their various 'E' grades ranging from E-1 to E-9. For those service branches recognizing a Warrant Officer rank, 'W' grades range from W-1 to W-5. Likewise Officers are scaled from O-1 to O-10.
China has quite a collection of natural bridges, including one that experts say has the longest span of any natural bridge in the world. The Fairy Bridge (Xianren Qiao), in southwestern China's Guangxi Zhuang Autonomous Region near the border with Vietnam, has a 400-foot span.
Most Famous Man-Made Arches: Rua Augusta Arch, Lisbon. 4. Arch of Cinquantenaire, Brussles, Belgium â The Arch was planned for the world exhibition of 1880 to commemorate the 50th anniversary of Belgium as an independent country. However, the construction was not completed in time.