[rwmj]

The EU's Freedom of Movement is a remarkable achievement. It's far from world wide and doesn't even aim for that, but it does allow you to move freely in ~30 sovereign countries. (Shame some 70 million of us just lost it)

[vidarh]

In a similar vein, African Union covers 55 countries and is working towards the same thing (though long off getting there).

[JeffRosenberg]

Agreed, although that doesn't help me as a US citizen :-)

[PaywallBuster]

Why not? Once your visa is approved (or you have visa on arrival) you can travel to any of the countries within the union without redoing your visa

[__s]

Even for you it means that if you get a Schengen visa (ie a visa for a country in the Schengen zone) that you may travel freely around the Schengen zone with that visa for 90 days