Arch, Pillar, Karst, limestone structures. 拱門, 柱石, 喀斯特地形, 石灰石結構

Awe: The enormity of the structures is clear compared to the size of the cavers ascending them, from a limestone spire in the Enshi canyon (left) to the Great Arch in Ziyun Getu He Chuandong National Park (right). Seeing these sights can be much easier, as a new glass elevator delivers less intrepid tourists to the foot of the arch

Forests of rock: Awe-inspiring images reveal the towering arches and pillars of limestone which dominate ancient lands of China | Mail Online
Read more: http://www.dailymail.co.uk/news/article-2673410/Forests-rock-Awe-inspiring-images-reveal-towering-arches-pillars-limestone-dominate-ancient-lands-China.html#ixzz36ivasogt
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Arch - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Arch
拱 - 維基百科，自由的百科全書
http://zh.wikipedia.org/wiki/%E6%8B%B1
pillar是什么意思_pillar的翻译_音标_读音_用法_例句_爱词霸在线词典
n.柱，台柱，顶梁柱； 墩，柱脚； （组织、制度、信仰等的）核心
网 络
柱；支柱；柱子；墩
http://www.iciba.com/pillar/
Karst - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Karst
喀斯特地形 - 維基百科，自由的百科全書
http://zh.wikipedia.org/wiki/%E5%96%80%E6%96%AF%E7%89%B9%E5%9C%B0%E5%BD%A2
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