The Kalyan Minaret is a minaret of the Po-i-Kalyan mosque complex in Bukhara, Uzbekistan and one of the most prominent landmarks in the city.
The minaret, designed by Bako, was built on an earlier existing structure called Kalyan by the Qarakhanid ruler Mohammad Arslan Khan in 1127 to summon Muslims to prayer five times a day. An earlier tower was collapsed before starting this structure which was called Kalyan, meaning welfare, indicating a Buddhist or zoroasterian past.
It is made in the form of a circular-pillar baked brick tower, narrowing upwards. It is 45.6 metres high, of 9 metres diameter at the bottom and 6 metres overhead.
Wikipedia https://en.wikipedia.org/wiki/Kalyan_Minaret
Address Bukhara, Uzbekistan
Coordinates 39°46'32.461" N 64°24'54.035" E