Diamond Cave / Phra Nang Nai Cave

Tucked into the north-east side of Railay Beach, this compact cavern offers an unusual pairing of natural geology and active spiritual practice. Dramatic limestone stalactite formations line the interior alongside Buddhist shrines and religious artifacts, giving the space a dual identity as both a natural attraction and a place of worship. A raised, well-maintained pathway runs throughout, meaning visitors can explore comfortably without crawling or scrambling — a feature that makes it accessible to most travellers. One of the more unexpected highlights is a resident colony of bats roosting in the upper reaches of the cave. Visitors who appreciate wildlife tend to find this a genuine bonus, though the bats are best observed without shining lights on them while they rest. Most people spend around 15 to 20 minutes inside, where the cooler air provides a welcome contrast to the heat of Railay Beach. Whether the experience justifies the entrance fee tends to divide opinion among visitors, so it is worth setting expectations accordingly. Good to know: The cave is open daily from 8:00 AM to 5:30 PM and charges an entrance fee of 200 baht per person. Arriving earlier in the day generally means smaller crowds. Shoes with a firm grip are recommended, as cave surfaces can be uneven in places. As this is an active place of worship, respectful behaviour toward the shrines and their surroundings is appreciated.