Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 5 months ago

The call for Salah which is called Athaan (Azaan) was made during the time of the Prophet Muhammad (SAWA) from a high place to  reach to maximum number of Muslims. This is a historic fact. Based on this fact, the minarets were constructed later on. 
Wassalam.