Beyazit Tower was built by architect Senekerim Kalfa of the Balyan family in 1828 under the reign of sultan Mahmud II. The tower is 85 meters in height and has four floors, 180 steps staircase to the top. It was built overlooking the Golden Horn for the purpose of detecting fires in Istanbul; baskets during the day and large red, green and white lanterns in the evenings were hung on the tower to indicate that there was a fire in the city. Today, the tower indicates the next day’s weather in Istanbul by changing lights; blue means nice weather, green means rain, yellow means fog, and red means snow. The tower is recently restored but unfortunately it’s still closed to the public at the moment, and stands in the grounds of University of Istanbul.