A modular game field bunker system comprises a plurality of interlocking frame pieces and a cover having an aesthetic feature disposed on at least an outer surface thereof. The interlocking frame pieces may be coupled together to form a structure having at least one wall. The structure preferably is fully enclosed by its walls and has an interior region defined therein for receiving a human player. The cover receives and fully covers the structure, and may partially define a doorway for entering and exiting the structure. The aesthetic feature of the cover may make the bunker appear in any of a variety of desired ways so as to customizably match a desired design scenario of the game field.