Mosteiro de Santa Clara-a-Velha 
Description
The Old monastery of Santa Clara had to be abandoned in the 17th century after the continued inundation of the site by the river meant it was no longer habitable. Left to decay for a couple of hundred years it was declared a national monument in the first half of the 20th century, but it wasn't until the late 1990's that the draining, dredging and restoration really took place. Today you can wander around the ruins of the convent and look at the impressive tide marks that show just how high the water had inundated the building.
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Getting There
Latitude: 40.202496; Longitude: -8.433289
What3Words: incline.promotes.reason
