Key attractions in South Korea’s capital, Seoul

Seoul, the refulgent capital of South Korea is unmatched when it comes to tunnels and underground facilities in general. Simply put, Seoul is the city of a thousand tunnels. For, going down a tunnel in Seoul can be anything from crossing a dual carriageway to getting into an underground mall or accessing the city’s metropolitan subway. It can as well be escaping the heat or cold above, depending on the season.

Seoul subway line [Joe Ombuor, Standard]