A business in Istanbul has transformed a 1500-year-old historical cistern into a thermal spa center
In Istanbul, a 1,500-year-old historical cistern next to the Hagia Sophia Mosque has been transformed into a spa center called Navitas Spa Cistern by a five-star hotel. During this transformation, a pool was added inside the historical cistern, and special massage rooms were created on the lower floors, raising concerns about the integrity of the