Seoul rewards the frugal: mural alleys, riverside parks and fortress ridges are all free, and a full market meal rarely passes ₩8,000. Three days here cover a 1912 bank vault museum, brass-coin lunch trays and a ₩1,000 bike along the Han.
Painted in 2006 to save a hillside shantytown from demolition, Ihwa's staircases and retaining walls carry flower steps, koi murals and angel wings tucked among lived-in houses. Residents still live here, so signs ask for quiet before 10:00.
The 1396 fortress wall runs along Naksan's 125m ridge, and the park beside it is open 24 hours with no ticket or gate. Stone ramparts frame a free panorama over Dongdaemun and Namsan, lit after dark by lamps set into the parapet.
Housed in a 1912 Renaissance-revival bank designed by Tatsuno Kingo, this museum is free and runs 10:00-17:00, closed Mondays and public holidays. Displays cover Joseon coinage, counterfeit detection under UV and a tonne of shredded notes.
An 11km stream uncovered in 2005 after decades buried under an elevated highway, sunk about 5m below street level so traffic noise fades out. Stepping stones, wall fountains and free evening lighting run east from Gwanghwamun toward Dongdaemun.
A narrow neighbourhood market west of Hongdae where locals shop and tour groups don't: hotteok around ₩1,500, vegetable jeon ₩2,000, a whole fried chicken about ₩12,000. Most stalls are trading by 10:00 and many still take cash only.
Buy ₩5,000 of brass yeopjeon coins at the café counter, take an empty lunchbox tray down the alley and pay stallholders in coins for tteokbokki, jeon and fried mandu. The coin desk runs 11:00-16:00 and closes the third Monday monthly.
Korea's oldest permanent daily market, trading since 1905, packs thousands of stalls under one roof. Bindaetteok mung-bean pancakes run about ₩5,000, mayak gimbap ₩3,000 and kalguksu ₩6,000, eaten shoulder-to-shoulder on plastic stools.
Plastic stools spill across the lane behind Euljiro 3-ga from about 17:00, where Manseon Hof has grilled dried pollack since 1980. Nogari costs roughly ₩2,000 a fish, draft beer about ₩4,000, and the tabletop burner comes free with the table.
A 338m granite ridge west of the palace district, free to climb from dawn to sunset, with restored Seoul City Wall running the crest. Halfway up sits Guksadang, the shamanic shrine relocated from Namsan in 1925, where rituals still take place.
Nanjido was a 98m landfill mountain until it was capped in 2002 and planted with silver grass. A 291-step staircase climbs to a plateau of reed paths and five wind turbines, with free views over the Han River and the Bukhansan skyline.
Seoul's public bikes cost ₩1,000 for a one-hour pass through the app, and a flat riverside path runs roughly 8km east from Nanji toward Seonyudo with no traffic lights. Docking racks sit every few hundred metres, so you drop the bike wherever you stop.
A 1978 water filtration plant on a Han River islet, rebuilt in 2002 as a park where the old concrete settling basins now hold ponds and climbing vines. Entry is free, gates close around midnight, and the arched Seonyu footbridge catches the sunset.