Where Data Tells the Story
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Each stick rises from the castles, fortresses, palaces and ruins around it. Together they hold 9,040 landmarks in 155 countries, each at its own coordinates. A stick stands on the middle of a patch about 150 km across at London's latitude, and its height follows the square root of the count, so a single landmark still shows.
The area around Koblenz, where the Moselle meets the Rhine, holds the most with 124, ahead of Liège with 117, Mulhouse with 110 and Vienna with 107. Four of the ten tallest sticks stand along the Rhine. Outside Europe the tallest is in Japan, around Hikone on Lake Biwa, where 59 landmarks run from Nagoya Castle to the palaces of Kyoto.
I built Castle Map, the free map these landmarks come from.