Lotte world in the Songpa district of Seoul boasts the world's biggest indoor theme park. Trolleys shaped like hot-air balloons hang from a rail circumnavigating the glass roof. From this vantage point visitors can survey the ice rink, carousel, rollercoaster and other attractions below. A young couple wearing leopard-ear headbands have come from Yongin, where Samsung has an amusement park of its own. Which is better? They are both good, they say, but Samsung's also has a zoo.
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