The Seville Cathedral, the largest Gothic church and third largest church in the world, was built on the site of a former mosque, with its construction beginning in 1402 and completing a century later. The Giralda tower, originally a minaret, was adapted into a bell tower, symbolizing the architectural blend of cultures. Historically, Seville was a central hub for Spanish trade with the Americas during the 15th and 16th centuries, which significantly impacted its wealth and construction projects.