The young people will gain an understanding about how the Church is apostolic by researching their diocese.
The young people should be able to explain how the Church is one, holy, catholic, and apostolic.
When was the diocese established?
Who were the bishops of the diocese?
Where is the cathedral located? Why was this site chosen? When was it built? What does it look like?
What are the names of the diocesan high schools?
How has the diocese grown?
You may also include neighboring dioceses or other the dioceses in your state.
Consider allowing young people who are new to your parish or those who move frequently to research a diocese they lived in previously. Talk about the similarities and differences between your diocese and others around the country.