Question 1

Where is Ueno Zoo?

Accepted Answer

Ueno Zoo is in Taito, Tokyo, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Jujutsu Kaisen does Ueno Zoo appear in?

Accepted Answer

Ueno Zoo appears in OP of Jujutsu Kaisen.

Question 3

Can I visit Ueno Zoo?

Accepted Answer

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

Question 4

Where was Jujutsu Kaisen filmed?

Accepted Answer

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