The nations have various safe-houses throughout the world. There is at least one in every country, and the larger ones have multiple.
This is all in case something goes wrong and they need to disappear quickly.
Of course, they also double as great places to host the annual family reunion.
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Hetalia Headcanons
FanfictionMostly Canada and America, but don't worry. There will be others too! May result in a One-Shots book. You have been warned.