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.
![On the frozen sea in a cavern eaten out by the waves under the coastal ice-cliffs, Adelie Land [Australasian Antarctic Expedition, 1911-1914] - Frank Hurley](https://i1.wp.com/storage.googleapis.com/stateless-tasmaniangeographic/2015/08/On-the-frozen-sea-in-a-cavern-eaten-out-by-the-waves-under-the-coastal-ice-cliffs-Adelie-Land-Australasian-Antarctic-Expedition-1911-1914-Frank-Hurley.jpg?h=520)
![Adelie Land, a grotto of mysteries [Australasian Antarctic Expedition, 1911-1914] - Frank Hurley](https://i2.wp.com/storage.googleapis.com/stateless-tasmaniangeographic/2015/08/Adelie-Land-a-grotto-of-mysteries-Australasian-Antarctic-Expedition-1911-1914-Frank-Hurley.jpg?h=520)
Underground Australia
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