Theodosius Cistern, Istanbul

One of many ancient cisterns of Constantinople that lie beneath the city of Istanbul, the Theodosius Cistern – built by Roman Emperor Theodosius II between 428 and 443 – was once part of the city's 250-kilometers-long water-supply system. Like the Basilica and Binbirdirek cisterns, it is once again open to the public, having undergone an eight-year renovation.

Although a visit here doesn't take long, it is worth seeing and hearing the history behind the place and how people used to store water in the olden days. A wonderful example of Roman ingenuity, the cistern is well lit and beautifully taken care of, with no waiting lines and free-of-charge acess. They also added sound effects which really make the whole experience much better, and there are even some artworks and historical handmade Turkish rugs on display. All in all, one of the most interesting and relaxing places in Istanbul!

Tip:
Use the stairs to get nice views from above the columns, and stop by Ruby Ceramics & Gift Shop across the road – you won't regret it!