Open a marker by clicking on the map or on a building from the dropdown menus. There will be some characters added to the end of the URL. Simply copy the URL and paste where you want to place the link.
How it works
Each building or point of interest has a specific code and type. This is added to the end of the map URL: "?building=(buildingCode)&type=(type)." For example, the Spoelhof Center's marker is: http://www.calvin.edu/map?building=SC and the Campus Store's marker is: http://www.calvin.edu/map?building=CS&type=POI