KD Station started life in 1918. The hulking building was a meat packing plant until destroyed by a large explosion that took several lives in the 1920's. There it sat, mostly dormant and used for various city purposes until recent years, when it was reclaimed as a historical landmark and turned into what all financially-viable landmarks have: a mall.
Actually, that's not completely true: KD Station is trying to be a family fun center, with displays about history to make it educational. There's miniature golf, a great costume shop, an area-4-star mexican restaurant, a blues club in the basement, and even a bowling alley. (Each is owned separately, so you'll have to pay separately, which is a pain if you've got several kids or a lot of time to kill.)
The problem I've always had with KD Station is simple: it's creepy. I mean give-you-goosebumps creepy. The displays on the wall of the time after the explosion include other artifacts like disembodied men's shoes that were knocked off dead men by the explosion. Parts of the building are uninhabited, and the elevator makes strange sounds. Great for a visit on Halloween, but for a first date, this place would be like taking her to a well-kept morgue.
Once they've developed it a bit more, gotten better lighting, and sealed off the old blast zones, KD station is going to be a great asset to Sioux City. Right now, though, it falls just a bit creepily short.