This is Princess Bubblegum's castle recreated in gingerbread and candy by Redditor IHaveAFluffyCat. Cool, IHaveASmoothTurtle. She posted a pictorial of the entire operation on Imgur, so if you're interested in trying and failing to repeat the process you're more than welcome. Hey, even if it turns out crappy looking, I'll still help you eat it. Mmmm, this is actually good -- what's your secret ingredient? "Strychnine." Heck yeah, $10 says I can finish the rest before I die.
Keep going for a couple more shots of the finished product.
Thanks to Leah, who agrees the best adventure times are the ones shared with good friends. Or that end in a pile of gold. I prefer the gold.