Managing water...

You see the aqueducts throughout the city. The water was brought to the city in the late 4th century from as far away as the Belgrade Forest over 200km away.  The system was used until the late 19th century.

The highway now runs through it and cars crash into it every now and then.

Once the water was in the city, they stored it in underground cisterns. Here the kids visted the Basilica Cistern built by Justinian in 532.

There are 336 columns that are 26 ft high. It holds millions of gallons of water and ensured a safe water supply for the palaces.

One interesting part was that two Roman sculptures of Medusa are reused in the cistern to hold up two columns. One is sideways and one is upside down. Reusing building materials was common.