There's a train station in the basement, a cinema above, and lots of shops. Basically, that's it. It's a good place for fashion shopping and has some other trendy stores. Some uncommon Asian foods and candy lie at the lowest level.
One interesting attraction is the Shot Tower museum, which is just beneath the large glass cone. This was used to produce gunshot by pouring molten metal into thin air and letting it form into spheres as it fell. You don't need to fly in space to produce weightless manufacturing!
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