The map below displays three different tools that can be used to show a 20 mile radius around the community colleges in Massachusetts. The three different tools are the geoprocessing buffer tool, the Euclidean distance tool, and Network Analyst. Take a look!

This a link to a web application I made for the viewshed of a 400 foot wind turbine on Mount Tom.
http://www.arcgis.com/apps/OnePane/azuretwitter/index.html?appid=62a32edf36cd44fcbbf98bc057771dc9

Here is the Viewshed for a 400 foot wind turbine placed on the highest point(365 meters) on Mount Tom in Holyoke, Massachusetts. Displayed is also Easthampton and Southampton.