History: Hoover Dam under construction, February 1934 (1280 x 1024)

https://upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Damforms.jpg/1280px-Damforms.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/7m42r4/hoover_dam_under_construction_february_1934_1280/?utm_source=ifttt