I always try to maximise screen real estate when building Dashboards. I do not like clutter but at the same time I want to provide as much information as possible.
In this Dashboard I have built a Dashboard with a Interactive Menu (collapsable) on the left which allows users to drill down from Region to Country and only then see a detailed view of individual Cities.
The nice thing about this Dashboard is that the menus are also informative and provide a guided way of navigating down the hierarchy.
Please see the Dashboard HERE