Barns are naturally spawned structures added by the Better Dungeons mod. They can be found in almost any biome but are most common in the Ice Plains biome. Generally, they hold no loot chests, and they can either be perfectly intact or almost completely destroyed. Typically, the floor is made of cobblestone with its walls out of wood planks. Windows are made of glass panes and oak logs.
Usually, they are 10 blocks high and have two floors with no basement. They make ideal places to pass the nights as they're usually secure in the measure (when not too damage) and are an excellent source of wood in wood-lacking Plains biomes.