Part of a stone circle
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Brazil's 1,000-year-old calendar

22 December 2015 Last updated at 16:39 GMT

A pre-colonial astrological observatory in the Brazilian rainforest was built to be aligned to the sunrise on the December solstice - which falls on 22 December in 2015.

The so-called Amazonian Stonehenge, in Brazil's northern-most state Amapa, is believed to have been constructed over 1,000 years ago.

But the site was only discovered in 2006, and plans are now are afoot to make it a national archaeological heritage park.

Video Journalist: Gibby Zobel

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