Than Bok Khorani National Park

This guide to Than Bok Khorani National Park leaves the park's famous emerald pool for a low limestone cave called Phi Hua To, the cave of the ghost's head, named for a skull once found on its floor. You'll hear about the more than two hundred ochre figures painted across its ceiling some three thousand years ago, people, birds, fish, crocodiles, and one striped, horned figure that stops every guide in their tracks. A tip: look before you touch, rangers ask the same of every visitor.