The cave is deep and dark; we need to use the torch and stepping carefully to reach the floor. Crossing the vertical staircases, tourists in Vietnam tourism could see the tank of skeletons. It was a big tank made from stone. There is an altar in front of it and there was a small square enough for the head of the human. Looking in the tank by the torch, visitors could see many parts of human bones, and a feeling of shivering came. There are some paper money, real money for dead people, etc.
According to the stories of many generations,there was a battle of the general Lu Gia. When he was detected by the enemy, he lead the soldiers to hide in this cave. Unfortunately after that the enemy discovered, they used stone to block the entrance and all the people inside were dead. Locals here said they found this cave with the skeletons overlapping each other and they made a tank of stone to put them in. Nobody could list the number of the skeletons but there are statistics written in books of history that there are about thousands of them.
Inside the cave there is also a spring called bone spring. In order to come to this spring, people have to cross a long path for more than half a day.
Source: vietnamcave.org