Wat Phra Kaew is the largest and most significant temple within the Kamphaeng Phet Historical Park, historically serving as the principal royal temple located adjacent to the ancient palace. This impressive laterite complex is renowned for its grand "Lion-supported" stupa and the iconic row of large seated and reclining Buddha statues made of laterite and once covered in fine plaster. As a spiritual center of the ancient city, it remains a masterpiece of Sukhothai-style architecture, reflecting the power and religious devotion of the era.