12 things to know about the iron age

The iron age started and ended at different times

Iron was the new metal of choice

Iron tools made life easier

The iron age was a time of constant war

Greece went dark

New forms of government started up

Architecture became more complex

New religions formed

Money was invented

From small tribes, an empire grew

Bog bodies hold iron age secrets

Wonders of the world were built

Timeline of the iron age.