All lookout towers have multiple staircases leading to a small office at the top with random loot. There can also be loot or containers on the ground. There may be enemies on the ground but never at the top or on the stairs unless they follow the player character up. The office is encircled by a balcony. When at the rail of the balcony the player character will be prompted to search the area. By pressing the interact button, "e" on the PC, map markers for all nearby locations will be added in gray on the player's map. Note that searching is only done once and shows locations in all directions.
The ranger lookout appears only in Fallout 76.