Located in Phong Nha Caves-Ke Bang, in the District of Bo Trach district, Quang Binh province, cave Painting Đoòng is largest natural caves in the world. Hang Sơn Đoòng formed about 2-5 million years ago, when water flows through the limestone rock has been buried along a fault line. Water erosion and create a huge in-ground tunnel under the mountains. In places where the rock is soft, the ceiling fell forming the vulnerabilities, long on the huge cave domes.6. flower paradise in Hitachi Seaside Park:
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