one of my personal favorites

The Cathedral of Cordoba is the most amazing huge (over 6 acres) building and one of my favorite places on the whole trip. Built on the foundation of a Christian church from about 300ad, the mosque was started in 723ad and added to three times as the Muslim population grew. Built with rows and rows of Roman (curved) arches (doubled for more strength like aqueducts), red and white bricks and sandstone in the arches. The builders incorporated some older columns from earlier Roman ruins. About 1200ad the Catholics took over and built a Gothic cathedral inside the mosque. The present bell tower was build around the original prayer tower. Two fabulous organs, beautiful carvings in the choir, on and on and on.

Top picture shows one of the two organs in the choir of the cathedral. The bottom picture is a sampling of the rows and rows of columns and arches.