All of Seoul below.
Jkp008 — Public domain · Jo Hanshin — CC0 · Jo Hanshin — CC0 · Jo Hanshin — CC0
The granite mountain that guards Seoul from the north and the highest peak within the city limits. It has three main summits, the highest being Baegundae at 836 metres, and its grey rock domes can be seen from most parts of the capital. The name means «mountain north of the Han River», and in Joseon times its peaks marked the northern edge of the city. The mountain became a national park in 1983 and is among the most visited parks in the world for its size, because metro lines and buses run to its trailheads. On its slopes are the stone walls of Bukhansanseong fortress from the eighteenth century, running over the ridges with their gates. The best-known route to Baegundae starts from the Bukhansanseong entrance and takes about three hours up, ending with a steep rock slope fitted with ropes and iron rails. From the top you see all of Seoul and the Han River. Those who do not want the summit will find easier trails among valleys, streams and fortress walls. Entry is free. Wear proper walking shoes, carry water and start in the morning, as the trails get crowded at weekends, especially in autumn.
All of Seoul below.
A stone fortress on the ridges.
Easier family trails.
Northern edge of Seoul; Bukhansanseong trailhead by bus from Gupabal Station (Line 3)
About three hours up from the Bukhansanseong entrance and two down. The last part is a steep rock slope with ropes and iron rails.