The whole construction included three small temples with the first at the foot of the mountain, the second at the entrance of Bich Dong cave and the third, also the smallest, on top of the mountain, viewing the whole stunning green valley below.

All three temples are made from rare wood, with tiles formed like the tail of a phoenix or the blade of the ancient weapon, seeing the construction come to life. From a distance, the temple looks like a wooden boat floating on the river.

The temple was built in the 18th century by two monks, who admired the peaceful and seductive landscape and decided to stay and build the temple for Buddhists to worship and pray for the prosperity of the country.

From the foot of the mountain, tourists have to climb dozens of stone stairs to get to the cave’s entrance, as well as the second temple. But in order to get to the third temple, tourists have to cross the cave. Inside the cave is a bronze bell made three centuries ago by the founders as well as the worship place of Buddha and the three gods in ancient belief.

Although going through a lot of reconstruction, the beautiful temples and cave make it a destination that everyone must visit once in a lifetime.

Na Mo Cave is situated in Na Ca hamlet, Huong Ne commune, Ngan Son District. The 15m high and 500m wide cave is in the side of the limestone mountain and looks out over a large river valley. Most of the surface of the cave can get sunlight, making it favourable for habitation.

Stone artefacts dating from 20,000 BC to 10,000 BC have been found in the cave, including simple working tools made from pebbles found in the river nearby. They have characteristics of tools dating back to the Hoa Binh culture.

Archaeologists have also found pottery objects made by hand and decorated with designs. Traces of cooking fires were also found, along with thick coal seams and burned red soil. A large quantity of animal teeth and bones and the snail and oyster shells were also discovered. Experts were able to affirm that the prehistoric cave dwellers lived on hunting and gathering. They were able to cut hunted animals into parts and grill them on the fire.

They also found a kind of red stone used to grind pigment powder that they used to decorate themselves. They also found a tomb containing the bones of a person who had been buried with a stone tool.

The head of the investigating group, Trinh Nang Chung from the Viet Nam Archaeology Institute, said Stone Age people inhabited the area for many thousands of years and were responsible for what has become known as the Hoa Binh culture around 10,000 BC.

In Jully 2011, traces of prehistoric man were also found near Ba Be Lake in the northern province of Bac Kan.

The main entrance to the cave is 2km from Ban Gioc waterfall, just off the road to Cao Bang. The wonderful beauty of Nguom Ngao spreads throughout the cavern. A British study in 1995 found the grotto to be 2,144m long, reaching heights of up to 60m, with three main entrances known as Nguom Ngao, Nguom Lom and Ban Thuon. At its main entrance you can feel the fresh, cool air from the natural filtering inside. Nature has endowed the cave with amazing rock formations that resemble humans, trees, plants and mythical animals.

The cave was formed due to the weathering process of limestone mountains by wind and water over many years. As a result, numerous sparkling multi-coloured stalactites hang from the high stone walls throughout the cave system. Along the way are stalactites of various shapes that resemble boats, cacti, forests, and terraced rice fields, reflecting the mountainous regions of Vietnam and the poles and valleys that are said to create a link between the earth and the heavens and the loving bond between men and women.

Nature has been busy with its work over the years to create attractive stone statues, such as those that resemble human forms, forest trees, animals of fairy tales, a huge lotus bulb and even a fairy combing her hair. Stalagmites appear to grow from the ground, but in fact are fed by dripping stalactites that vertical or horizontal. Many locations feature a large cluster of formations to indulge visitors. One of the most impressive stalactite clusters is one that forms an upside-down lotus chandelier, featuring fairies with flowing long hair on the corners. It is nestled a little below the oncoming path for perfect viewing.

Local people discovered Nguom Ngao in 1921, but the cave was not officially opened to tourists until 2006 when paths were built to lead visitors to many corners of the cave. The electricity system is due to be installed, but it’s probably sensible to take a torch. The main cave is enormous, with one branch reaching almost all the way to the waterfalls, where there is a ‘secret’ entrance. Normally a guided tour will take about an hour and will only go about 400m into the cave; but ask if you would like to see more. A full tour takes about two hours.

The 31-kilometre cave, situated in the middle of a limestone mountain range, is the longest dry cave in Asia.Its width ranges from 30 to 150 metres, with an average height of around 60 metres. Tourists have recently been allowed to visit seven kilometres of the cave that have previously been off limits.

Unlike Phong Nha cave or Tien Son cave, which also belong to the Phong Nha-Ke Bang complex, the atmosphere in Thien Duong remains relatively cool and moist, with an average temperature of from 20-21 degrees. The cool air can be felt sitting in front of the cave’s opening.According to many, the stalagmites in Thien Duong cave are more spectacular than those found in Phong Nha Cave. Many people claimed to have seen images of tigers, elephants, fish and even gods in the formations within the cave.

An explorer comes to climb down to Loong Con cave. The water spumes are evaporating to create the cloud inside the cave.

A cave dome being collapsed long time ago allowing light in Son Doong cave, then the trees grows fast.

Explorers in En cave (swallow cave). In rainy season, water could be raised inside of the cave up to 100m and soaking the stone flaps that the explorers are standing in.

The cave inside is narrowed when it comes deeper. The water is raised then it is withdrawing to Son Doong cave.

Explorer stop to watch the stone wall looks like waterfall near the way out of En Cave.