General challenges
Posts published in response to non-photo specific challenges appear here
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The colours and street art of Oaxaca
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Gallery: the penguins of Antarctica
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The cloak full of flowers
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A stroll around Villa Coyoacán
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Of whales and birds in Baja
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Teotihuacan, where the gods were created
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Sleepwalking through Mexico City
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A postcard from Mexico: blue whales in the Sea of Cortez
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Gallery: bird-watching at Mandina Lodge
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To market, to market …