Queensland State Archives posted a photo:
Fort Lytton is a heritage-listed 10th-century coastal fort in the suburb of Lytton in Brisbane, Queensland. The name “Fort Lytton” is also used to describe the one square mile military base that surrounded the fort. Fort Lytton was built in 1880-1882 and operated until 1965.
The fort consists of almost a hectare of buildings, gun pits, tunnels and other structures embedded in a pentagonal earth mound wall, surrounded by a water-filled moat.
Description source:
Wikipedia
View the original record at the Queensland State Archives:
Item ID 2692229