Navy — 3 museum-grade prints in this palette. Fes el-Bali, the old medina of Fez, has been a centre of Islamic learning and artisan craft since the ninth century — home to the University of Al-Qarawiyyin, the Chouara tanneries, and Bab Bou Jeloud, the famous blue-tiled gate into the souks. Fez remains synonymous with indigo-dyed textiles, zellige mosaic work, and the horseshoe arches that frame countless riad doorways — motifs that travel-poster artists from Art Deco lithographers to contemporary Etsy sellers return to again and again. Lisbon's Remodelado trams — especially the iconic line 28 through Alfama, Graça, and Baixa — are among Europe's last hill-climbing streetcar experiences, while azulejo faience lines metro stations, churches, and façades across Portugal. Belém Tower guarded the Tagus estuary during the Age of Discovery; the National Pantheon at Santa Engrácia crowns the city's eastern skyline. Haussmann's renovation of Paris between 1853 and 1870 standardized the six-storey apartment block with aligned cornices, mansard roofs, and continuous balcony lines — a visual grammar that still defines the city's boulevards from the Marais to Montmartre's lower slopes.