Why Did Roman Roads Last Two Millennia?

Imagine you are building a LEGO castle. If you just stack bricks, they might fall apart in the wind. But if you use special sticky glue between every brick, your castle becomes super strong!

The Romans were master builders. They did not just pile up rocks for their roads. They mixed something very special into their cement. This special mix is called pozzolana ash. It comes from volcanoes in Italy.

Here is the fun part: most modern cement gets weaker if it stays wet for too long. But Roman concrete gets stronger when it touches water! When seawater hits their roads and bridges, tiny crystals grow inside the cracks like super glue.

This is why we can still walk on Roman roads today, even after two thousand years of rain and sun. They built with nature's help, not against it.