You must have noticed that the buildings built today do not last long. They have to be repaired every few years.
At the same time, many thousands of years old buildings are still standing strong.
Many arguments are given behind this. Special materials were used in the construction of these building. This made them stronger.
Buildings have remained the same for centuries due to a specific construction techniques.
Paddy straw was mixed in the bricks of some building so that they did not suffer much damage from earthquakes.