Imagine there's no borders...
Today, from Estonia and Finland it is now possible to travel overland to Portugal and Italy without stopping at a single border post thanks to the Schengen Agreement:
abolition of systematic border controls between the participating countries. Covering a population over 400 million and a total area of 4,268,633 km², it includes provisions on common policy on the temporary entry of persons (including the Schengen Visa), the harmonisation of external border controls, and cross-border police co-operation.
This is a massive advancement on the situation previously and shows a great level of trust in the competence of the EU countries who are now on the edge of the new European Union border. Overstayers will enjoy it most of all, but what a positive and ambitious project to have come about.