VGFacts

So you may or may not have heard of Globetrotter 2 (released in the US as "Round the World Challenge"), but long story short, it's an edutainment game where you travel around the world, and whatever city/location you're in is represented by a map you walk across.
Within the game's files is a folder named "CITIES.zip", which contains the data for each location used in the game, and there's 42 folders in the directory, with one of these being the common data for all cities.
Counting all of the locations you can visit in-game, though, there are only 38 locations, so after I did some digging around in the CITIES.zip folders, there happens to be data for three unused cities: Oslo (Norway), København (Denmark), and Stockholm (Sweden).

These cities all appear to be fully programmed, and even have music clips to play upon entering them (though they all sound about the same), yet these three locations are never acknowledged in-game and cannot be accessed without hacking them back into the game.

Now for a few samples of this:

This is the area data for Stockholm (referred to as area 19 in the game's files), containing what appears to be everything needed in order to properly travel across the map and find landmarks.

This is the in-file render of København's map (4_minimap.bmp). A larger resolution of this would be used in-game.

The collision map for Oslo (38_collision.bmp), which tells the game which region the player is currently in.

Rather strange that none of these locations are used in-game, seeing as it was published and distributed by a Swedish company.

Mystery solved!

The data for these cities is actually left over from the original Globetrotter! Sound files from the original still exist within the sequel's files, and about half of the cities from the original were reused for Globetrotter 2. If the full data for these three cities still exists in Globetrotter 2's data, it most likely means that they were meant to return like the others, but were never added into the final product.