That reminds me of The Great Tower I built on Minecraft. A wooden tower that stretched above the clouds with torches spreading across the walls. And great fire in the middle of the bottom floor, with a bit of stone to keep it from burning the whole place up. Then I decided to expand the tower downwards. I dug hole in the floor, immediately came to a cave complex. And a creeper immediately jumped out of the hole, blew away that little stone from the fire, and the entire tower disappeared in flames.