How many places that appear in "Gintama" actually exist? Where are they?

I only know a few

Gintama ED2

This is a real tourist scene in reality, Salar de Uyuni. Salar de Uyuni is located near the town of Uyuni in the Sky Mirror of southwest Bolivia. It is the largest salt marsh in the world.

Episode 88 (if I remember correctly) the Tower of Babel is the Tokyo Sky Tree

There is also Lake Toya (this is a real Japanese tourist attraction )