Beyazıt Tower
Located within the Central Campus of Istanbul University, Beyazıt Tower was built in 1749 in the Beyazıt district of Istanbul to monitor and report fires. The tower, which has a height of 85 meters, was originally built of wood but burned down in the Cibali fire in 1756. The tower, which was rebuilt in 1826, burned again during the Janissary uprising. Beyazıt Tower was built for the third time by architect Senekerim Balyan in 1828 during the reign of Sultan Mahmud II.
Beyazıt Fire Tower consists of three sections: guard floor, signal floor and starboard floor. At that time, fires were announced from the Beyazıt Tower during the day by hanging baskets and by lighting a lantern at night. The tower, which was illuminated in different colors at night for a long time, was used to announce the next day's weather forecast to Istanbulites. Illuminating the tower in blue would indicate that the weather would be clear the next day, with green rain, yellow fog and red snow. This practice was ended in 1995 and started again in 2010 with the initiative of Istanbul Metropolitan Municipality.
Source Türkiye Culture Portal History of Istanbul