Despite being smaller than the state of Michigan, South Korea manages to pack a whole heck of a lot into an area that generates the world’s 15th highest gross domestic product (About $1 trillion.) How? Nobody can be sure, but whether it’s the Miracle on the Han River or the people’s sheer determination to be better, South Korea is a place of superlatives. One of those superlatives is Lotte World, the world’s largest indoor theme park.