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.

Extinct Mega Penguin was two metres Tall.

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Forget emperor penguins, say hello to the colossus penguin.
Newly unearthed fossils have revealed that Antarctica was once home to the biggest species of penguin ever discovered. It was 2 metres long and weighed a hefty 115 kilograms.
Palaeeudyptes klekowskii lived 37 to 40 million years ago.
This was “a wonderful time for penguins, when 10 to 14 species lived together along the Antarctic coast”, says Carolina Acosta Hospitaleche of the La Plata Museum in Argentina.
She has been excavating fossil deposits on Seymour Island, off the Antarctic peninsula.
This was a warmer region 40 million years ago, with a climate like that of present-day Tierra del Fuego, the islands at the southern tip of South America.
Now she has uncovered two bigger bones. One is part of a wing, and the other is a tarsometatarsus, formed by the fusion of ankle and foot bones. The tarsometatarsus measures a record 9.1 centimetres.
Based on the relative sizes of bones in penguin skeletons, Acosta Hospitaleche estimates P. klekowskii was 2.01 metres long from beak tip to toes.
Its height will have been somewhat less than its length owing to the way penguins stand. But it was nevertheless larger than any known penguin.
via Extinct mega penguin was tallest and heaviest ever – New Scientist.