Hoover Dam
I had no idea it looked like this!
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Link to specific places either as a Google Maps page or a decimal latitude and longitude written like this: lat/lng:55.949400,-3.200000.
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The trick is to zoom out and see just how freaky giant Lake Mead is in comparison to the tiny fingernail rind that is the Hoover Dam.
Interestingly, the force exerted on a dam depends only on the depth of water it holds back, not how much of it there is.