File:991 - Old Great North Road, Between Devine's Hill and Mount Manning - walls up to 13m high, interlocking stone blocks without mortar. blocks weigh up to 660 kg. (5051461b2).jpg
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991_-_Old_Great_North_Road,_Between_Devine's_Hill_and_Mount_Manning_-_walls_up_to_13m_high,_interlocking_stone_blocks_without_mortar._blocks_weigh_up_to_660_kg._(5051461b2).jpg (400 × 259 pixels, file size: 113 KB, MIME type: image/jpeg)