This is Hwaseong Fortress, located in Suwon, some 40 kilometers south of Seoul.
The late 18th-century defense fortress, representing an innovative military architecture of the Joseon Dynasty, was registered on the UNESCO World Heritage list in 1997.
Dozens of expats are taking a stroll around the UNESCO site, as part of one-day tour organized by Korea's culture ministry and the Korean Culture and Information Service.
"I really love the way Koreans present their culture, and present their country. This program made me realize how rich the Korean culture is."
"It is an excellent program, we're enjoying every bit of it. Wonderful people, and of course, Korea is a fascinating country.
The tour program invites Korea's international residents to explore UNESCO-listed world heritages.
The tours are free of charge for all foreigners living in Korea.
Anyone who's interested in signing up can register online at www-dot-heritageinkorea-dot-kr.
Six more such programs will be provided throughout the year - each focusing on different UNESCO-registered Korean cultural assets- both tangible and intangible, such as the Korean martial art Taekkyeon, and Kimchi-making culture.
Each of the tours will include a discussion and a lecture, and of course, a hands-on visit to heritage sites or the region of the intangible traditions.
Park Ji-won, Arirang News.