“It’s difficult to imagine that just over 20 years ago, this was a vast elevated highway carrying 168,000 cars daily through the heart of South Korea’s capital.”

Now it’s a world famous people-place.

They’ve since removed 16 more elevated highways in the city.

https://www.theguardian.com/world/2025/jan/17/seoul-cheonggyecheon-motorway-turned-into-a-stream