The only one I'm aware of is the Smithsonian app that was also in the Nook app store. I don't remember it having maps and floor plans. The one I'm thinking of mainly had videos.
It may seem silly, but one of the main reasons I switched to the CM10.1 ROM is for the buttons at the bottom of the screen. On my old Nook Tablet, you could swipe across the bottom from right to left to "go back". As far as I know, they didn't put anything like that into the HD+. The button the change between all the open apps is pretty handy.
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