The Industrial biomes features lots of things such as mills, cranes, a new theme for houses, rivers, piles of rubble and barrels (which are lootable). This biome also features a canal running through it (sometimes more than one). Many robots roam here.
This is the best biome for loot, as it contains the most buildings. Despite the patrols, looting houses is not difficult as the area covered in valuable buildings is too large to be entirely guarded.