Definitely need a sarcasm smiley.
But the Berlin wall is a good example. It only had to cover 96 miles. Take the following and multiply by 20.
Quote:
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The top of the wall was lined with a smooth pipe, intended to make it more difficult to scale. It was reinforced by mesh fencing, signal fencing, anti-vehicle trenches, barbed wire, dogs on long lines, "beds of nails" under balconies hanging over the "death strip", over 116 watchtowers,[54] and 20 bunkers. This version of the Wall is the one most commonly seen in photographs, and surviving fragments of the Wall in Berlin and elsewhere around the world are generally pieces of the fourth-generation Wall. The layout came to resemble the inner German border in most technical aspects, except the Berlin Wall had no landmines and no spring-guns.[48]
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FYI, I own a piece of the Berlin wall.
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