“大秦直道”（又称：秦直道）是秦始皇统一华夏后，于公元前212年至公元前210年命大将蒙恬监修的一条重要军事通道，相当于现代的高速公路。大秦直道的建成，为秦王朝北拒匈奴提供了后勤保障，提高了秦朝军队的快速反应能力。大秦直道共穿越十四县，七百多公里，路面最宽处约六十米。如今，部分完整的秦直道被列为陕西省重点文物保护单位。随着中国西部的开发，秦直道成为延安考古、探险、观光热点。历史剧《大秦直道》由陈家林、萧锋导演，林海鸥编剧，寇世勋、吴京安、丛珊、李东学、毕彦君、杨幂等主演。该剧已通过审核，将在央视播放。中国第一个统一王朝秦朝的历史，凝结在富丽堂皇的阿房宫和骊山陵墓里。而鲜为人知的是，阿房宫和骊山陵墓都曾因一个工程而暂缓修建，这就是从咸阳直通长城北部九原的“秦直道”。这条由秦始皇亲自主持修建的全长七百公里的“秦直道”，被誉为全人类历史上的第一条高速路。 秦统一六国，盗匪四起，大将蒙恬虽全力征战，却因道路不畅、粮草难以运送而损失惨重。蒙恬、蒙毅兄弟奏请秦始皇修建从咸阳直通长城北部九原的大通道，引发百官争论。重臣李斯和赵高以人力、财力紧缺为由，激烈反对。历经周折磨难和多次奏请，秦始皇终于同意暂缓阿房宫工程，启动空前绝后的“斩山堙谷，直通之”的浩瀚筑路工程——“秦直道”。秦始皇将国内最后的三十万人马和国库中最后的财力物力交由蒙恬、蒙毅修建秦直道。这条道路带来和谐边塞的同时，也激化了宫廷权势争斗，蒙恬将军和李斯先后被奸臣赵高陷害而死。秦始皇驾崩于巡游路上，赵高伪造诏书将真正的王位继承人扶苏赐死，立始皇幼子胡亥为皇帝。秦二世三年，赵高政变，强令胡亥自绝。始皇侄子子婴继位，杀赵高于蒙氏兄弟墓前以祭，蒙氏兄弟的墓被迁移至他们为之付出生命的秦直道旁。 两千多年的时间过去了，秦直道上依旧寸草不生，至今仍是人们无法解开的一个谜，它已经同万里长城一道成为了中华民族精神的象征。
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