Exploration has always been in the list of priorities of the different nations in the world. Even before the building of formal cities and political structures, communities would explore different lands in the hopes of expanding their territory. This means that the different nations of the world have different ways of marking their territories.

During the age of exploration, different nations with the capacity to travel and expand set out to discover the new world. This was the same time that they figured out that the world was spherical and not flat. They planted their world flags on the new parcels of land that they claimed for themselves. This signified their dominance within that area as well as telling the neighboring areas about their presence. This was done because they wanted to expand not only on a geo-political level but also on an economic level. This means that they also traded with the different nations that they might have come across.

These days, the last frontier is probably in the dark depths of space. Exploration has not lost its appeal or its priority in the list of the different nations of the world. They continue to find ways of exploring other planets either by using telescopes, or by directly setting out in space craft. Different nations with this capability have already set their world flags on the moon as a sign that they too have achieved some degree of space travel and exploration. At this moment, they are looking for an earth-like planet.