The National Library of Australia has compiled and shared a wonderful collection of public domain historical photographs of caves and hidden spaces throughout Australia. You can learn more about the book, Underground Australia written by historian Michael McKernan, at the NLA Bookshop.

Adelie Land a grotto of mysteries Australasian Antarctic Expedition 1911 1914 Frank HurleyCave prison taken on a survey trip undertaken in 1927 for the Flying Doctor Scheme by Cameron TW c1927Conway shovel in operation No 4 power station and men Kiewa December 1947 State Electricity Commission of Victoria by Frank Hurley c1910Frank Moon lying underneath some stalactites Buchan Caves Victoria by John FlynnHawkesbury train emerging from tunnel New South Wales by Frank Hurley c1910Miners by WJ Mildenhall c1901On the frozen sea in a cavern eaten out by the waves under the coastal ice cliffs Adelie Land Australasian Antarctic Expedition 1911 1914 FrOpal miner George Lowe chips away at the face of his opal mine Lightning Ridge 1953 by Bill BrindlePost office and telegraph station Coober Pedy by John FlynnRiver Cave Margaret River Western Australia by Frank Hurley c1910Snowy Mountains Scheme T 2 tunnel work 1957 Dept of Overseas Trade Melbourne by Wolfgang SieversThe Cascades River Cave Jenolan Caves New South Wales by Frank Hurley c1910The dazzling beauty of the Persian Chamber Orient Cave Jenolan Caves New South Wales by Frank Hurley c1910This plate commemorates James Carvosso Wiburd who retired in 1932 after forty seven years service at Jenolan Caves by Frank Hurley c1910Unidentified Australian Army soldiers constructing a dugout scenes of Army life in Australia during World War II by John Flynn c1937Visitors to the Right Imperial Cave Jenolan inspecting the Sentinel with the Grand Stalactites behind them by Frank Hurley c1910Yanchep Crystal cave Western Australia by Frank Hurley c1910
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