Basilica Cistern-Yerebatan Sarnıcı

Do you wanna see something last from Constantinoples?
Honestly, even though I have heard about this cistern so many times, I have never been into. However, it is not an obstacle for you! It is constructed around 500 AD. The place is 140 meter (0.08 miles) long and 70 meter (0.04 miles) width. If you have claustrophobia, I do not recommend this place to you, because you need to go down 52 stairs to reach the place.
Why did Constantinoples construct this cistern?
As you will experience throughout the time you will stay here, in Istanbul it is not always rainy and you may not see any rain during summer. In order to prevent drought, they construct the cistern to store almost 100.000