1. One or more non-transitory computer-readable storage media storing computer-executable instructions that, when executed on one or more processors, direct a mobile device to perform operations that record a subject of interest and a location on a map where the subject of interest was recorded for publication in a map overlay, the operations comprising: continually tracking a series of locations of the mobile device as the mobile device travels through the tracked locations; and while the mobile device is at a particular location of the tracked locations: capturing with the mobile device, the subject of interest and location data that corresponds to the particular location, wherein capturing the subject of interest includes at least one of: using a camera functionality of the mobile device to capture a photograph; using a video camera functionality of the mobile device to capture a video; using the mobile device to save a document; using the mobile device to save text; using the mobile device to capture audio; using the mobile device to save a media file; using the mobile device to save an email; or using the mobile device to save a text message; allowing a user to create additional descriptive content associated with the subject of interest; and transmitting the captured subject of interest, the additional descriptive content, and the location data from the mobile device to a site that publishes the captured subject of interest and the additional descriptive content to a digital map at a position on the digital map that is based on the particular location.