Famous for the Roman Aqueduct probably built about 1st century AD and continued to provide water to the city until mid-19th century. It has 75 single arches and 44 double arches with a maximum height of 28.5 meters. Also the Gothic Cathedral - over the top - didn't know when to stop with the gargoyles and lions. The Alcazar (Castle) was started in 1120AD but was continuously damaged and re-built over the centuries. Most recently by King Philip II who after marrying Anna of Austria added sharp slate spires to reflect the other castles of Europe. Thought to have been used as a basis for Disney Castles.