Love these things about Winter: a warm fire, wool socks, a glass of mulled cider or wine and reading a good book. Add to all that a cat on your lap and a dog asleep in front of the fire and you have the definition of happiness.
Okay, I know this is a spa and not a house. But if there was a "waterfall" in my house, with a small pool to hang out in, in a room with tons of natural light, and all that good stuff.I would never leave my house.
Indoor swimming pool in tunnel underneath house - This would be obscenely expensive, but I think the idea is pretty cool. Having a pool that resides in a tunnel underneath your house is wholly unnecessary, but a pretty dope idea in terms of indoor pools.