boca nord mine exit drainage system estany

1734 abbot age ancestral ancient antique architectural architecture began boca building buildings catalan catalonia catalunya century channel conduction constructed construction cultural culture daylight daytime desiccation design detail detailed details drainage drying during education estany europe european exit facade fifteenth heritage historic history huge humid local marys massive medieval middle mine mines monastery nord northeastern outdoors past population saint sixteenth southern stonewalls swamp swamps system technology tradition traditional urban village wall walls water works