Seville’s immense cathedral is awe-inspiring in its scale and majesty. The world’s largest Gothic cathedral, it was built between 1434 and 1517 over the remains of what had previously been the city’s main mosque. Highlights include the Giralda, the mighty bell tower, which incorporates the mosque’s original minaret, the monumental tomb of Christopher Columbus, and the Capilla Mayor with an astonishing gold altarpiece. Note that children must be aged 11 years and over to access the rooftop tours. Audio guides cost €3.