Actually, it is not my exaggeration, it is what scholars have said about the Indus cities. They are like modern cities.
Check this out: http://india.mrdonn.org/indus.html
Homes: Houses were one or two stories high, made of baked brick, with flat roofs, and were just about identical. Each was built around a courtyard, with windows overlooking the courtyard. The outside walls had no windows. Each home had its own private drinking well and its own private bathroom. Clay pipes led from the bathrooms to sewers located under the streets. These sewers drained into nearly rivers and streams. This was a very advanced civilization!
Thanks to modern technology and international rivalry, nearly 1,400 Indus sites (towns!) have now been discovered. That is a very big civilization, large enough to be called an empire, only there is no evidence that these people were governed by emperors who lived in palaces or large estates. Rather, the opposite has been discovered. Some homes are a bit larger than others, but that might be due to a larger family unit.
What else have scientists discovered about this fascinating culture? LOTS! Their towns were laid out in grids everywhere (straight streets, well built homes!) These people were incredible builders! Scientists have found what they think are giant reservoirs for fresh water. They have also found that even the smallest house at the edge of each town was linked to that town’s central drainage system. (Is it possible that they not only drained waste water out, but also had a system to pump fresh water into their homes, similar to modern plumbing? What a neat thought! Who were these people? Remember-these systems were built over 3,500 years ago!)
The above suggests the Indus civilisation to be a very modern one. It shows signs of middle class populations, standardization, city planning and a strong scientific spirit. What is very interesting to note here these cities were built and destroyed 7 times and rebuilt on top of another, and the the oldest one was the most advanced and perfect. It shows no sign of slow growth - they were built immediately just like modern day cities are built.
The fact is skeletons were indeed found in these cities that were highly radioactive and these cities were all of a sudden abandoned, and nobody can yet explain why they were abandoned all of a sudden. The Mahabharata shows us clearly that a huge war took place using weapons of mass destruction. It describes it in explicit detail.