13th century · All Facts

13th century
Poland's Wieliczka and Bochnia Royal Salt Mines have been mined since the 13th century and contain chapels and statues carved from salt.
SrcUNESCO World Heritage Centre

Next evidence →55 languagesEach Voyager Golden Record carries greetings in 55 languages, natural sounds, music, and a printed message from President Carter — selected for NASA by a Carl Sagan–led committee.

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not a single spanNo bridges cross the Amazon River — not a single span across this continental waterway, per Britannica.
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