Question 1

Where is Old Koshu-kaido?

Accepted Answer

Old Koshu-kaido is in Hokuto, Yamanashi, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of mono does Old Koshu-kaido appear in?

Accepted Answer

Old Koshu-kaido appears in EP2 of mono.

Question 3

Can I visit Old Koshu-kaido?

Accepted Answer

Yes. Old Koshu-kaido is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was mono filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Old Koshu-kaido is one of those real places (EP2).