The bell tower of the Church of St. Peter and Paul in Mostar is quite simple, but extremely high. On the base of it an information sign tells a lot about the height and the diameter of the tower, the construction year, the number of steps, the architect, etc.
"The church has the tallest bell tower in Bosnia and Herzegovina (107 meters). It is also the tallest bell tower in southeast Europe."
Source and further information: en.wikipedia.org/wiki/Church_of_St._Peter_and_Paul,_Mostar
"The Peace Bell Tower was built on the site of the old bell tower of the church of St. Peter and Paul from 1866. That one burned down in 1992. There are five original bells from 1927 as well as two new ones from 2015 in the top of the tower. You can go up and view the city from the top of the tower."
Source and further information: www.tripadvisor.com