Kaesong is the most historically interesting destination in North Korea after Pyongyang, and the easiest to justify on purely cultural grounds. The city was the capital of the Koryo dynasty (918–1392), which unified the Korean peninsula and gave the country its name — "Korea" is a Western rendering of Koryo.
The old city centre retains a handful of well-preserved sites. The Koryo Museum occupies a former Confucian academy (Sungkyunkwan) and houses a good collection of celadon pottery, bronze bells, and other Koryo-era artefacts. The Sonjuk Bridge nearby is where the scholar Chong Mong-ju was assassinated in 1392, ending the dynasty. A red stain on the bridge is said to be his blood — or the iron content of the stone, depending on who you ask. Either way, locals treat it as sacred. The Namdaemun south gate and the ruins of Manwoldae palace, the medieval royal seat, complete the picture of what was once one of East Asia's great capitals.
The Tomb of King Kongmin outside the city is a UNESCO-recognised site: twin burial mounds for the 31st Koryo king and his Mongol queen, flanked by carved stone animals and guardians. Nearby, the Mausoleum of King Wang Kon honours the dynasty's founder in much grander, more recently reconstructed style. The setting is peaceful and the stonework worth examining.
Kaesong sits just north of the DMZ, about 160 km south of Pyongyang, and the standard tour from the capital includes a visit to the Joint Security Area at Panmunjom — a striking mirror image of the same tour from the southern side. The city also hosts the Kaesong Industrial Complex, a joint inter-Korean economic zone that operated from 2004 until South Korea suspended it in 2016 — the kind of geopolitical detail that gives Kaesong an additional layer of interest for anyone following Korean affairs.