Hideaways.

Some places for kids to run away, hide, play, get up to mischief and sleep.

Found via Giver's Log.

the treepee, found via here

a backyard pavillion, made by this lovely lady, found via One Pretty Thing

French playhouses, found via a favorite blogger of mine

i know, wow, right? available here

available here

this looks totally doable, found via One Pretty Thing

available here
ready to throw over your card table, and available here

beautiful tents available here and here