The Balloon Hut is used to make balloons. Braves enter this hut and use three pieces of wood to construct a single balloon. The balloon building can be built anywhere on flat land, but you will need room - this building is the biggest of the game. It also takes a big ammount of wood to get completed (11 wood piles in total).

Each balloon will cost 3 wood piles.

Make sure to build this building in a safe place, or it will get destroyed, meaning that you just wasted wood, time and building room.

It's very rare to see balloons in Populous online, but who knows, maybe they will get in the future Populous meta.

You will unlock this building in level 13 of the single player.