unacquainted tourist in tham chang cave vangvieng city laos.

adventure ancient asia asian attraction beautiful beauty cave cavern caving chang city colorful crowd dark destination discovery exploration famous geological geology grotto holiday inside interior journey landmark landscape lao laos laosvangvieng light limestone mineral mountain mysterious natural nature pathway people rock scenery speleology stalactite stalagmite stone tham tourism tourist town travel tunnel unacquainted underground vacation vangvieng