Gyeongju, the ancient capital of the Silla dynasty, is a treasure trove of historical heritage in South Korea. Once known as Seorabeol, it boasts significant archaeological remains such as the Cheomseongdae observatory, Bulguksa temple, and Seokguram Grotto. These sites, along with royal tombs and pagodas, tell the story of a civilization that thrived from the 1st century BCE to the 10th century CE. Recognized by UNESCO, Gyeongju's historical areas are often described as one of the largest outdoor museums in the world.