elvas: forte da graça
Elvas not only boasts a massive wall around the entire city that dates from the great age of fortress construction in the 1700s, but the nearby Forte de Nossa Senhora da Graça also impresses from its commanding location. As a modified 400-meter (1,300 ft) mountain, the fortress could easily defend Elvas & see any invasion force coming from Spain next door. Most of the fort sits submerged into the mountaintop, making this a fantastic feat of engineering. I have no drone, but this gives you an idea of the scale:
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