What can monuments tell us about the Prehistoric period?

History

The Celts used iron because it was a better metal than bronze.

The farmland was better quality on hills.

There were more useful resources on hills.

From the Roman invaders who wrote about the Celts living in Britain.

The Celts wrote down in books about their life.

We have lots of evidence from clothes and other artefacts left behind.

How do we mostly know about the Celts living during the Iron Age?

Celtic culture, including religion and diet, was spread out across Europe.