Originally Posted by Blackcat31:
I have the Little Tikes Castle and a couple other playhouses they made a few years back. I leave them outside all winter and they do well.
My DCK's love every single one of them and they are probably the most played with "toys" I have.
The castle belonged to my own children and has lasted at daycare for 20 years! So I recommend any of the Little Tikes stuff... they are durable, washable and tons of fun! 
Our other daycare had one of these. The kids loved it! It was big enough for us as an adult to go inside to help a child climb. The downfall was some kids who were 3-5 would climb on the outside or climb up from inside and lift themselves to the very top and jump off. With basic rules on play though it is a great castle. We had 8 kids in it at once, but we did remove the small side door because the littles kept getting hit with it or pinched fingers.