Also on these boards
Secret passageway! Cute idea if your house is designed properly. I remember a family friend's house had a hidden play room under their stairs. To get in, we crawled through a little door in their coat closet. Way fun for kids!
this small wooden staircase also works as tiny closet (via Design*Sponge) could be used in tiny house design in place of ladder?
Converted silo on a farm. They've put in three stories—kitchen/bath at the bottom, office/sitting room above (where the balcony is), bedroom at the top. It's all connected by a staircase that spirals around, and the sound of rain on the roof is lovely.