Medieval canals and the Ghent Altarpiece.
The most complete Gothic cathedral in France, with 176 windows of unrepeatable twelfth-century blue.
Master Paul's 18-metre carved altar, the tallest Gothic altar in the world, inside a walled Spis town.
The city of three cultures on a rock above the Tagus, with El Greco, a synagogue and a Damascene steel trade.
Medieval marble monastery, UNESCO-listed.
Serbian Orthodox monastery with thousands of medieval frescoes, UNESCO-listed.
An avenue of turquoise-tiled mausoleums in Samarkand, the finest tilework in Central Asia.
Fifteenth-century monasteries frescoed inside and out, still vivid.
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