A micronation is a piece of land which claims to be a sovereign state - but isn't. By the most bare-bones definition, this means all you have to do to create one is declare that you've done so.
Some micronations are serious attempts driven by political ideology, while others are more like practical jokes. By some accounts, over 400 currently active micronations now exist. Here are 15 of the most interesting from the past few decades.