The Yunus Emre Camii (1349), the oldest Karamanoğlu building in town (not the oldest building overall: a few monuments are from the Seljuk era, and thus older).
Adjacent to the prayer hall of the mosque, there is a türbe (mausoleum) that is said to be the burial place of Yunus Emre, the famous 13th/14th century poet and Sufi mystic, who lived in Karaman for a number of years. (Note that there are six other and widely dispersed localities disputing the privilege of having his tomb within their boundaries).

Correspondent: J.M.Criel, Antwerpen.
Source: ‘Karaman (Tarihi ve Kültürü)’ (Ilhan Temizsoy & M. Vehbi Uysal) – Konya 1981 & Wikipedia.