Fez factory, is along the shores of the Golden Horn, nowaday facility International Fair Congress and Culture Center. This is the Fez Factory ( Feshane ), founded in 1835 to meet the increased as the production of uniforms for the Ottoman Imperial Army. It is one of the oldest factories in Turkey.
Google Maps - Fez Factory -Feshane

Fez factory ( Feshane) founded in 1835. 19 mid-century The Ottoman army had gone to change clothing Feshane Weaving Factory has been a big role in the provision of new clothes. After a long service life, Feshane now serves as an exhibition and conference hall center.

You can use Metrobus : Take off Ayvansaray station then you can walk for 5 minute.
You can use Public Bus but you take off Feshane bus station.
İETT Şehir otobüsleri - Eyüp

Fez Factory - Feshane serves as an exhibition and conference hall and as an entertainment center during festivities of Ramadan. İf you have oppurtunities,you should go to Feshane during of Ramadan like a festival area you enjoy too much. From the pier of Feshane you can boat trips abroada replica of royal boats that were once used by Ottoman sultans to cross the İstanbul Strait.