Altamira cave
Almost 300 metres long,has artifacts going back 18,000 years as well as cave paintings that are about 25,000 years old.
Cuevo del castillo
cave paintings are of bison,dogs,horses and mammoths.
This blog will look at places that are located below ground level,whether natural like caves,sinkholes etc or man-made like the underground structures in the valley of the kings in egypt etc
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