Question 1

Where is Tronchi?

Accepted Answer

Tronchi is in Gifu, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Hyouka does Tronchi appear in?

Accepted Answer

Tronchi appears in EP21 of Hyouka.

Question 3

Can I visit Tronchi?

Accepted Answer

Yes. Tronchi is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Hyouka filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Tronchi is one of those real places (EP21).