Monsaraz

Fortified Old City in Alentejo facing Spain's border.
Over the Alqueva Man-made lake the area has been inhabited since pre-history and settlement remains from that time can be visited in our days.
Due the almost inexistent light polution Monsaraz hosts one of the most exciting astronomical observatory in the World.
https://en.wikipedia.org/wiki/Monsaraz

https://darkskyalqueva.com/en/dark-sky-observatory/

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