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This Daily Discovery is from Instagram user brivn - Named one of the Top 10 Construction Achievements of the 20th Century in 2001, Hoover Dam is one of the most amazing structures ever built. This shot of the Pat Tillman Bridge was shot by the briliant @Brian Cahapay. For more great photos follow @Brian Cahapay! >> Don't forget to tag your photos with #ink361 or #ink361_mobile to get discovered. Follow us at http://ink361.com/ink361 : a great way to explore Instagram.

The Mike O’Callaghan – Pat Tillman Memorial Bridge is its proper name, but that’s a bit of a mouthful so we’ll stick to the Hoover Dam Bypass, although strictly speaking that refers to the entire bypass project, a massive construction effort intended to increase security and relieve traffic problems at the dam itself.

Hoover Dam in the Black Canyon of the Colorado River, on the border between the US states of Arizona and Nevada. It was constructed between 1931 and 1936 during the Great Depression.

Railroad tunnel dug through the mountain so that construction material for Hoover Dam could be delivered to the site.