7: Hoover Dam, Border of Arizona and Nevada
Known earlier as Boulder Dam, Hoover Dam, a concrete arch-gravity structure, is built in the Black Canyon of the Colorado River. It is located near Boulder City, Nevada, close to the border of the states of Nevada and Arizona. The construction, started in 1931, was completed on 1st March, 1936, two years ahead of scheduled date despite massive difficulties and Great Depression. The construction involved the use of some unproven technologies, labour of thousands of workers and the loss one hundred lives. The dam was dedicated to the nation by President Franklin D. Roosevelt on September 30, 1935. Currently, Hoover Dam is an important tourist destination and draws approximately a million visitors every year.
Address: Hoover Dam Access Road, Boulder City, NV 89109