On June 6, 1944, more than 160,000 Allied troops landed along a 50-mile stretch of heavily-fortified French coastline, to fight Nazi Germany on the beaches of Normandy, France.
National monuments are located in 31 states as well as in the District of Columbia, the Virgin Islands, American Samoa, the Minor Outlying Islands, and the Northern Mariana Islands. Arizona, with 18, has the largest number of national monuments, followed by California with 15 and New Mexico with 14. At least 65 national monuments protect places of natural significance, including 12 geological sites, seven marine sites, and five volcanic sites.
Most Famous Man-Made Arches: Arc de Triumph, Paris. 2. The Gateway Arch, St. Louis, United States â A 630-foot (190 m) monument in St. Louis, Missouri. Clad in stainless steel and built in the form of an arch, it is the tallest man-made monument in the United States, and the worldâs tallest arch.