Seoul is one of the largest cities in the world and with the conubation home to some 24.5 million people there's some serious planning to do if visitors even hope to scratch the surface of sightseeing around the city. It is a world leader in technology and has the largest metro in the world and has been settled for over 2,000 years. Yes, it'll take some getting used to but have a good visit to this fascinating metropolis.
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