Phraya Nakhon Cave is a stunning natural cave located within Khao Sam Roi Yot National Park in Prachuap Khiri Khan province, Thailand. The cave is famous for its natural beauty and its unique location, with a hole in the roof that allows sunlight to shine down into the cave, creating a magical and mystical atmosphere.

To reach the cave, visitors must first hike a steep and rocky trail through the jungle, which takes about 30-45 minutes to complete. Once inside the cave, visitors are greeted with a large cavernous chamber, filled with stunning stalactites and stalagmites, as well as the iconic image of a royal pavilion sitting in the middle of the chamber.

The pavilion was built in the 19th century by King Rama V, who visited the cave and was so impressed with its beauty that he ordered the construction of the pavilion as a royal throne room. The pavilion is now a popular spot for photos and is considered one of the most iconic and recognizable images of Thailand.

Aside from the pavilion, there are several other smaller chambers and passages within the cave to explore. Visitors should be aware that the cave can be slippery and dark, so it's important to wear sturdy shoes and bring a flashlight or headlamp.

The best time to visit Phraya Nakhon Cave is during the dry season, from November to April, when the weather is cool and dry, and the cave is easier to access. Visitors should also plan to arrive early in the morning to avoid the crowds and to witness the magical light streaming through the hole in the roof.