Tham Phu Kham

Cave in Vang Vieng

Image by R. Fox Photography Getty Images

The vast Tham Phu Kham is considered sacred by Lao and is popular largely due to the lagoon in the cave. The beautiful green-blue waters are perfect for a dip after the stiff climb. The main cave chamber contains a Thai bronze ­reclining Buddha, and from here deeper galleries branch off into the mountain.

Get here via a scenic paved road to the village of Ban Na Thong. From there follow the signs towards the cliff and climb 200m through scrub forest.