Do not use ALL CAPS for headlines and headings.
Use ONE of these styles:
1. Lower case, except for the first word and proper nounsIstanbul at home in a dark room in Tünel
2. Upper case for all words except for “a, an, the” and prepositions if not part of the titleIstanbul at Home in a Dark Room in Tünel
Dragoman Style Guide for Magazines and Journals