Hai Van Pass or Sea Clouds Pass offers an impressive landscape of verdant mountains and clear blue skies, overlooking Da Nang City, Tien Sa Port, Son Tra Peninsula, and South China Sea. Crossing over a spur of Truong Son mountain range between Thua Thien-Hue Province and Da Nang City, it stands at 500m above sea level, making it the highest pass in Vietnam. The 25 kilometre-long mountain pass is popular amongst thrill-seeking motorcyclists due to its winding roads, sudden curves and blind corners, while its lookout point offers gorgeous views of Da Nang Bay. The pass also hosts the ancient Tran Dynasty’s Hai Van Gate, Hai Van Tunnel (the longest in ASEAN), wartime gun towers, and a decrepit French-built fort that was later used as a bunker by South Vietnamese and US armies during the Vietnam War. Prior to the construction of the Hai Van Tunnel, the mountain pass was notorious for its fair share of fatal accidents – look out for small altars set along the roadside that are dedicated to perished victims. http://www.vietnam-guide.com/da-nang/attractions/hai-van-pass.htm

Phong Nha – Ke Bang National Park - is a national park in Quang Binh province in central Vietnam with an area of 885 km². The National Park has the oldest karst mountains in Asia, which has formed about 400 million years ago. There are hundreds of caves, underground rivers and long underground passages with stalactites and stalagmites. In 2005 the park has been discovered a new species of gecko. The park has about 300 caves and caverns with a total length of 70 km. British and Vietnamese scientists have examined 20 km. There are many underground rivers, streams and waterfalls in the park. Phong Nha - Ke Bang included on the UNESCO World Heritage List. Serious exploration of the caves began only in the 1990s when it first Cavers forced deep into Phong Nha Cave, one of the longest cave systems in the world. Paradise Cave was discovered in 2005, and in 2009 a team found the world's largest cave - the Son Doong. In 2015, the public was given access to two cave systems. Serious exploration of the caves began only in the 1990s when it first Cavers forced deep into Phong Nha Cave, one of the longest cave systems in the world. Paradise Cave was discovered in 2005, and in 2009 a team found the world's largest cave - the Son Doong. In 2015, the public was given access to two cave systems. https://www.vietnamsite.nl/phongnhakeeng.htm