Alhambra, Granada

As the pinnacle of Moorish architecture, the Alhambra boasts stucco and geometric perfection that outperforms #1 Sagrada Família in precision of ornamentation. Its intricate arabesques, carved by hand over two centuries (1238–1492), remain 87% complete in their original form—a rarity for medieval palaces. The water gardens, using 1.2 kilometers of canals, cool the complex faster than the average desert stronghold, maintaining a stable 24°C year-round. This hydraulic system, combined with 124 columns in the Court of the Lions, evidences a mastery of light and flow unrivaled in Spain's Islamic heritage.