My history teacher wants me to create a project about the classical age.. It can be related to art, science, law, music engineering or architecture. I have no clue what to do.
I was thinking about a model or diorama but not sure what to do.

Well you can do a diorama of the Acropolis, or a display about Greek currency, since banking was started then, or a report on Plato, or Socrates. Just search "classical age" for ideas.
Good Luck!