Question 1

Where is St. Francis Xavier's Cathedral?

Accepted Answer

St. Francis Xavier's Cathedral is in Inuyama, Aichi, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Fate/Zero does St. Francis Xavier's Cathedral appear in?

Accepted Answer

St. Francis Xavier's Cathedral is a real place that appears in Fate/Zero.

Question 3

Can I visit St. Francis Xavier's Cathedral?

Accepted Answer

Yes. St. Francis Xavier's Cathedral is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Fate/Zero filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and St. Francis Xavier's Cathedral is one of those real places.