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While you can't see them in this photo, there are anti-aircraft guns mounted on the walls.
A tender is out for an extension to the wall that surrounds the royal palace in Muscat, Oman. The extension will be 6 kms long, 8 metres tall (6 metres above ground, 2 metres below), 600mm thick concrete and must not have any horizontal joints that could be used to scale it. Oh yes, and it must include an anti-tank ditch.
Are they expecting unwelcome visitors?
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