The best way to learn is by seeing and experiencing. This holds true not just for children but for adults as well.
An image can convey what a thousand words fail to do.
Visiting a place is an experience that cannot be taught to a child in a number of classroom sessions.Nothing can take the place of personal experience.
A school tour to a different country has a major psychological impact on a young impressionable mind. Each human being is different and it amazing what each child perceives from what they see.