Nicely restored and well worth the visit. Amazingly, no charge for entry. There is an elevator inside, however in order to access it one must climb down or up several steps ! The entrance is through the modern glass structure located on Piyer Loti Caddesi. It is a 9 minute walk from Sultan Ahmet Square (about 650 meters).

Entrance to Şerefiye Sarnıcı (Theodosius Cistern)

This 360 photo was taken inside the cistern using Google Pixel phone