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The French might say it's the Eiffel Tower. In Italy, it could be the Leaning Tower of Pisa. In Egypt, it would probably be the pyramids. If you have a specific location in mind, you might want to...
the manneken pis is one. The historical cities of Bruges, Gent, Antwerp, Mechelen, Leuven,...The Market Square in Brussels, the atomnium, some very nice museums, Flanders Fields around Ypres...