A coral reef is made of thin layers of calcium carbonate A coral reef is made of thin layers of calcium carbonate National Ocean Service National Oceanic and Atmospheric Administration U.S. Department of Commerce
Arches is located in northeastern Utah, near the city of Moab. The park is famous for over 2,000 natural stone arches and offers much to the outdoor traveler. There is a 40-mile paved loop tour of the park with numerous trailheads and outlooks.
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.