Pay a visit to Suleymaniye Cultural Details Centre. This center is undoubtedly an NGO managed by volunteers who also work inside the Suleymaniye Mosque. They offer free information about Islam and the Islamic culture equally inside the mosque and inside their center. They've an interesting presentation about Islam and mosques. https://is-wordpress-is-free70470.techionblog.com/37080620/istanbul-personal-portfolio-wordpress-theme-for-dummies