Aljafería Palace
Aljafería Palace is Spain's finest Islamic-era building outside Andalusia. Built in the 11th century as a fortified palace for Zaragoza's Muslim rulers, its fortress-like exterior contrasts with the stunning beauty of its interior craftwork, including the mihrab, intricate arches, and the orange tree patio. It's part of the UNESCO World Heritage Site of Mudéjar Architecture of Aragon.