The White Tower (which is now actually brown) is a symbol of ...

The White Tower of Thessaloniki is a monument and a museum on the waterfront of the city of Thessaloniki, the capital of the region of Macedonia in northern Greece. The present tower replaced an old Byzantine fortification, known to have been mentioned around the 12th century, that the Ottoman Empire reconstructed to fortify the city's harbour sometime after Sultan Murad II captured Thessaloniki in 1430.