The Sewer System
Their sewer system was the first one ever and so it had to take a lot of planning and work. In Mohenjo-Daro, lots of complex sewer systems have been found. This is a developing one because water is able to flow through it successfully and takes out dirty water and brings in clean water. The time it took to plan this out and build it must have taken a lot of time. It also would have taken a ton of effort to build it. This is also one of their most advanced and most widely used inventions around the world. Mohenjo-Daro planned out their sewer systems. They also planned out everything else.