Why did John need a 'great, high mountain' to see the holy city? It wasn't just about a good vantage point.
The angel carries John away 'in the spirit' to a high mountain. This isn't just a scenic overlook; mountains in Scripture often symbolize places of divine encounter and revelation.
A Place Apart
Think of Moses on Mount Sinai receiving the Law, or Jesus on the Mount of Transfiguration revealing His glory. These moments happened on elevated, often isolated, ground, separating the participants from the everyday.
Elevated Perspective
Being on a 'great, high mountain' allows John to grasp the immense scale and divine origin of the New Jerusalem. It's a perspective only God can grant, lifting him above earthly limitations to see His ultimate plan.