Dark Hollows and Forsaken Stores are two open world locations that contain valuable loot. During the day, they're full of Infected, so it's smart to explore them at night.

Forsaken Stores provide you with rare Craft Parts that can be used to create Weapon Mods and other more advanced items.

Dark Hollows are the best place to find valuables and Old World Money. Loot them to increase your wealth.