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mythologyandhistory

Did you know that #Roman road design included #safety features?

In the ruins of #Pompeii, you'll notice small white stones interspersed with the large paving ones along the extensive roads.

Those white #stones are 'cats eyes', i.e. gems that have a single line of inclusion of crystals of another mineral inside.

Upon light reflecting on them (from the #moon), they enable the walker to see that they are still on the right path!

youtu.be/74n6TgXbgAQ?si=56oPfp

#history

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