Diamond Cave / Phra Nang Nai Cave

Tucked into the north-east side of Railay Beach, Diamond Cave — locally known as Phra Nang Nai Cave — offers an unusual combination of geological and spiritual interest. The cavern's interior features dramatic limestone stalactite formations alongside Buddhist shrines and religious artifacts, creating a space that functions as both a natural attraction and an active place of worship. A raised, well-maintained pathway runs through the cave, meaning visitors can explore without crawling or scrambling, making 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 find this a genuine bonus, and the bats are best observed respectfully without shining lights on them while they rest. The cave is relatively compact, with most visitors spending around 15 to 20 minutes inside. The cooler air within the cavern provides a welcome contrast to the heat outside. 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 — a detail that divides visitor opinion, so it is worth factoring into expectations. Arriving earlier in the day tends to mean smaller crowds. Wear shoes with a firm grip, as cave surfaces can be uneven, and consider a light layer if you are sensitive to the cooler temperatures inside.