This is the castle playhouse made by Minnesotan (that's somebody from Minnesota) Andrey Rudenko using 3-D printed layers of concrete. Andrey built his own concrete-extruding 3-D printer and printed the pieces to make this castle to test it out. Looks like it works. Eventually, Andrey hopes to use the printer to print his own 2-story home. Lofty goals. Now, let's play rescue the princess. You go sit in the castle and pretend you're being held there against your will by an evil sorcerer, then I will come rescue you. *hours pass* "I thought you said you were coming to rescue me?" Yeah yeah yeah -- after my shows are over.
Keep going for several more shots and a video of a wall section being printed.
Thanks to BCC, whose initials probably don't stand for Booty Clap Clap like I wish they did.