It is fun and easy to make maps online. There are many online mapping tools available.
Here is another example of the kind of map you can create using ArcGIS Online. These points show locations of some dams in the Middle east. The colors symbolize the date the dam was completed. This is a subset of the data available here.
Yellow = Constructed up to 1985
Purple = Constructed 1985-1997
Green = 1997-2003