First discovered in 2005 by the British Cave Research Association, Thien Duong Cave lies within the Phong Nha – Ke Bang Park's conservation area.
Thien Duong has been lauded as "the largest and most beautiful cave in the Phong Nha – Ke Bang area" by British spelunkers. It is said that the cave's beauty is reminiscent of an imperial palace.
The Truong Thinh Joint Stock Company has invested around 98.4 billion VND (5.07 million USD) in the Thien Duong Cave Project that is expected to draw visitors from all over the world.
The Truong Thinh Joint Stock Company has also opened the 632 billion VND (32.6 million USD) second phase of the Sun Spa Resort on the Bao Ninh beach on the banks of the Nhat Le River, also in Quang Binh Province.