Question 1

Where is Ōte-mon Gate?

Accepted Answer

Ōte-mon Gate is in Chiyoda, Tokyo, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Sword Art Online II does Ōte-mon Gate appear in?

Accepted Answer

Ōte-mon Gate appears in EP1 of Sword Art Online II.

Question 3

Can I visit Ōte-mon Gate?

Accepted Answer

Yes. Ōte-mon Gate is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Sword Art Online II filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Ōte-mon Gate is one of those real places (EP1).