Having an indoor exhibit would be ideal, but costly. Wild Arctic comes to mind. Not the size of the exhibits because they're small, but the premise. If the building was for two bear habitats and had natural rocks and taiga material (such a thing?). It could work. Controlling the air and taking out the humidity to the point it actually matches their native range. It's warming everywhere. Yet, American Zoos put Polar Bear exhibits in areas with longer, sustained exposure to high temperatures and humidity. While those cold caves, streams and such are nice, they only offer some repreive. With an indoor set up, they could make snow and switch exhibits where one day it is filled with snow, the other, not so much. I wonder if something like that could be done if it would have any benefit on successful yields from breeding? An indoor area for them would be nice to have the aurora borealis dance on the ceiling and make it a sight to see. Incorporate some space to host events and such and would probably add to any facility willing to shell out the ducats.