Simatai is 3hs from Beijing and I made the trekking in 4hs.
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https://en.wikipedia.org/wiki/Great_Wall_of_China
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https://www.youtube.com/watch?v=9gL9Vg-5mro
Movimento Charleston - Aula de Lindy Hop de 2015.09.16 - Cia Terra
https://www.facebook.com/travellerni
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https://www.youtube.com/watch?v=x8zTSBE9iks