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Originally Posted by Google Expert
A guard tower. Pre-fabricated concrete slabs trucked in and just dropped in place vertically boom boom boom. Not unreasonable for a team to do a mile a day like that.
Israel has a border wall with egypt too. that's the first picture in the thread.
Saudi Arabia's 1000-mile long wall:

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You missed the biggest one.
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In fact, a long-distance cycling route along the length of the former border called the Iron Curtain Trail (ICT) exists as a project of the European Union and other associated nations. The trail is 6,800 km (4,200 mi) long and spans from Finland to Greece.
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I remember seeing it Austria and Germany. It was chilling knowing that the guards would shoot anyone trying to get over. That's assuming the land mines didn't get them first.