Thiên Đường Cave (Paradise Cave) is a cave in Phong Nha-Kẻ Bàng National Park, UNESCO's World Heritage Site, 60 km northwest of Đồng Hới city. Paradise Cave is located at an elevation of 200 meters above sea level, near the west branch of Ho Chi Minh Highway, in Son Trach Commune, Bố Trạch District, Quảng Bình Province, Vietnam. The cave was discovered by a local man in 2005 and the first 5 km of this cave was explored by explorers from the British Cave Research Association in 2005, the whole 31 km was explored and publicly announced by the British cave explorers. This cave is 31 km long, longer than Phong Nha Cave which had been considered the longest cave in this national park. The height can reach to 72 m and 150 m wide. The limestone formation is also more spectacular than that of Phong Nha Cave. The British cave explorers were impressed by the beautiful and spectacular stalactites and stalagmites inside this cave and they named it Thiên Đường Cave (Paradise Cave). This cave is opened for tourism in 2010. 

Surrounded by forested karst peaks, this staggering cave system in Phong Nha-Ke Bang National Park extends for 31km, though most people only visit the first kilometre. The scale is breathtaking, as wooden staircases plunge into a cathedral-like space with vast alien-looking stalagmites and stalactites illuminated by large flood lights. Get here early to beat the crowds, as during peak times (early afternoon) tour guides shepherd groups using megaphones.

To explore deep inside the cave beyond the barrier at the end (and with luck see the eyeless cave fish that are part of its ecosystem), book a 7km Paradise Cave tour (2,650,000d, minimum two people), which includes a swim through an underground river (there's a boat if you can't swim) and lunch under a light shaft. Bookings can be made through Phongnha Discovery Tours and other accommodation options.