Laos is a popular tourist destination known for its beautiful scenery and ornate temples, however not many people venture below the surface and discover that what is underground is perhaps even more spectacular.
The wondrous Tham Khoun Ex caves are so exquisite they don't look real at first, which is perhaps why locals believe that spirits inhabit the underground wonderland.
Cave photographer, John Spies, 59, captured the sheer magnificence of the vast, yet intricate, underground wonderland.
Enormous banks of terraced flowstone decorate the walls of the cave in many places. This slowly growing mound of white and orange calcite is one of the larger deposits along the river passage
Rippling reflections: A blue-tinted glow from outside illuminates the entrance chamber of the cave
Not your usual day out! Floating on clear deep water and reflections near the cave entrance, visitors can either bring their own kayaks or rent boats from the local community to paddle deep inside the cave and marvel at its wonders
Tham Khoun Ex caves, commonly known as Xe Bang Fai River caves, feature imposing stalagmitemade of mineral deposits.
With over 15km (nine miles) of awe-inspiring passages and wide expanses of water, it really is one of Laos' hidden treasures.
There is even a vibrant forest thriving at the upstream entrance to the caves, the lush green colour contrasting with the enormous white and orange banks of terraces flowstone that decorates the walls.
Freshwater reserve in Laos will be diverted for fracking such like California, UN Agenda 21 executed by their politicians.