Beyazıt Tower

Beyazıt Tower, also named Seraskier Tower, from the name of the Ottoman ministry of War, is an 85-metre-tall (279 ft) fire-watch tower located in the courtyard of Istanbul University's main campus (formerly Ottoman Ministry of War) on Beyazıt Square (known as the Forum Tauri in the Roman period) in Istanbul, Turkey. Beyazıt Tower was ordered by the Ottoman Sultan Mahmud II (1808–1839), and designed by Senekerim Balyan, who built it of stone in 1828 on the place of the original wooden Beyazıt Tower, which was destroyed in a fire and was constructed earlier by the architect's brother, Krikor Balyan. It is currently equipped with a lighting system to indicate weather conditions in different colors. Red colour means snow, blue—nice and clear weather, green—rain and yellow—fog.

Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).