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.
Mexico Cholula de Rivadavia. The largest pyramid, and the largest monument ever constructed, is the QuetzalcÃ³atl Pyramid at Cholula de Rivadavia, 101 km (63 miles) south-east of Mexico City. It is 54 m (177 ft) tall, and its base covers an area of nearly 18.2 ha (45 acres). Its total volume has been estimated at 3.3 million mÂ³ (166,538,400 ftÂ³)compared with the current volume of 2.4 million mÂ³ (84,755,200 ftÂ³) for the Pyramid of Khufu or Cheops.