The cathedral in the centre of Toledo. The Cathedral of Saint Mary of Toledo is an immense Gothic church at the heart of the ancient Spanish capital of Toledo. Built between 1226 and 1493, and modified and added to since, it was built over the site of the city’s great mosque and is home to a unique Transparente – a hole in the roof which angels swirl around. There are numerous stained-glass windows within, as well as museums which hold works by El Greco, Goya and Valazquez.