Cardboard Heroes Castles: The KeepPrint a castle you can put in your backpack! Cardboard Heroes Castles are great looking 3 D structures that are easy to set up for play . . . and designed to fold down again for travel and storage! Cardboard Heroes Castles are full color, gorgeous, and designed to be portable. This set can be used by itself to create either a castle with enclosed courtyard or a massive towered keep. Or use it as an expansion to the Walls and Towers set. The more sets