世界遗产中心 - UNESCO World Heritage Centre
长城. 公元前约220年，秦始皇下令将早期修建的一些分散的防御工事连接成一个完整的防御系统，用以抵抗来自北方的侵略。长城的修建一直持续到明代（1368至1644年），终于建成为世界上最大的军事设施。
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Explore the list of UNESCO World Heritage sites and learn about their significance and cultural importance.
UNESCO World Heritage Centre - World Heritage List
World Heritage partnerships for conservation. Ensuring that World Heritage sites sustain their outstanding universal value is an increasingly challenging mission in today’s complex world, where sites are vulnerable to the effects of uncontrolled urban development, unsustainable tourism practices, neglect, natural calamities, pollution, political instability, and conflict.
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UNESCO World Heritage Centre - The Criteria for Selection
World Heritage partnerships for conservation. Ensuring that World Heritage sites sustain their outstanding universal value is an increasingly challenging mission in today’s complex world, where sites are vulnerable to the effects of uncontrolled urban development, unsustainable tourism practices, neglect, natural calamities, pollution, political instability, and conflict.