BEFORE & AFTER - Edited in the GIMP with G'MIC processing flow
Window in the Cathedral/Mosque of Cordoba, Spain
Here is a brief description of it from Wikipedia:
The Cathedral and former Great Mosque of Córdoba, in ecclesiastical terms the Catedral de Nuestra Señora de la Asunción (English: Cathedral of Our Lady of the Assumption), and known by the inhabitants of Córdoba as the Mezquita-Catedral (Mosque–Cathedral), is today a World Heritage Site and the cathedral of the Diocese of Córdoba. It is located in the Andalusian city of Córdoba, Spain.