This is a project for school that I did and ended up selling to a company for mass production. It is the NYC Subway system, turned into a calendar, with the stops labled on the left as hollidays, and dates and days of the week on the map. The routes and parks, streets, and areas are 100% accurate, with slight modifications to make the months read easier. 

The holidays are listed as if they are the names of the stops on the subway lines. I found a really cool website that gives at least one holliday per day of the year, and used them to fill out the "stops".

The lines are more or less actual NYC subway lines, following almost the exact routes each line takes. Obviously, the line neames have changed to the numbers or first few letters of the months, but the map and lines are authentic. The stops are labled as the dates and the days of the week. The parks, streets, and areas are all accurate, made from an actual copy of the NYC subway system map.