Andalusia: the Mezquita (mosque) of Cordoba
The Mezquita (mosque) of Cordoba is an architectural wonder, even today, although building a Cathedral in its center did not exactly improve it.
Even the emperor Carlos (Charles) V is said to have commented as follows: “You have destroyed something unique in the world and built something that can be found anywhere.”
Well, nice quote, but after all it was Carlos himself who had ordered the construction of the cathedral.
Still, the maze of columns is breathtakingly beautiful.