Bab Gedid Mosque
Kos, Greece
The Bab Gedid Mosque, also known as the Eski Mosque (from Eski Camii, meaning "the old mosque") was an Ottoman-period mosque on the Aegean island of Kos, in southeastern Greece, before it was badly damaged in an earthquake in 1933 and finally demolished a few years later in 1935. Today its octagonal stone minaret is all that survives from the original structure.
Mosque data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).