Question 1

Where is Horin Park?

Accepted Answer

Horin Park 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 Steins;Gate does Horin Park appear in?

Accepted Answer

Horin Park appears in EP4 of Steins;Gate.

Question 3

Can I visit Horin Park?

Accepted Answer

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

Question 4

Where was Steins;Gate filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Horin Park is one of those real places (EP4).