Cavern, Adelie Land, c.1913.

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Photograph: On the Frozen Sea in a Cavern Eaten Out by the Waves Under the Coastal Ice-cliffs, Adelie Land, Australian Antarctic Expedition c.1913
by Frank Hurley.
In 1911, Australian explorer Douglas Mawson left Sydney on a three-year Antarctic expedition.
On board was Australian photographer Frank Hurley.
Here, along the shore of Antarctica’s Adelie Land, Hurley captures a long cave hollowed out by waves.
Source: Gallery: The underground Australia

‘Iceberg Graveyard’ by Josselin Cornou.

Image Credit: ‘Tabular iceberg” Photograph by Josselin Cornou, France, Shortlist, Open, Nature (Photo: 2017 Sony World Photography Awards)
“On our way to the 66 parallel south — in Antarctica — we discovered a recent iceberg graveyard,” explains French photographer Josselin Cornou.
“A massive part (as large as a U.S. state) of the ice shelf broke down a few years ago due to global warming, displaying a splendid but scary visual
Those icebergs are about 100 feet tall from the sea level, transporting big amount of fresh water, waiting to be dissolved in the ocean.
The scene was magnificent, but also incredibly scary.”
Source: 12 breathtaking images from the Sony World Photography Awards | MNN – Mother Nature Network

Trinity Church, King George Island.

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Photo: James L. Boka on Wikipedia)
This strange little church, perched on the black sands of King George Island, looks like something out of Harry Potter, but is actually the southernmost Orthodox Christian church in the world.
It was built by the Russians in the 1990s to minister to their permanent settlement in Antarctica, Bellingshausen Station.
Manned by a couple of volunteer priests at all times, the chapel also serves a number of other international bases in the area.
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Unlike most of the squat, unadorned buildings in Antarctica, the church brings a warm dose of old world flare to the island, and seems almost miraculous amongst the harsh surrounds.
via Chill Out at These 9 Antarctic Outposts | Atlas Obscura.