Journalists rely on image and video verification to support their investigations and often utilize open source tools to verify user generated content, but current practice requires experts be involved in every step of the process. Additionally, lacking custom tools to support verification efforts, experts are often limited to the utility of existing, openly available tools, which may or may not support the interactions and information gathering they require. We aim to support the process of geolocating images and videos through crowdsourcing. By enabling crowd workers to participate in the geolocation process, we can provide investigative journalists with efficient and complete verification of image locations. Parallelizing searching speeds up the verification process as well as provides a more extensive search, all while allowing the expert to follow up on other leads or investigative work. We produced a software prototype called GroundTruth which enables crowd workers to support investigative journalists in the geolocation of visual media quickly and accurately. Additionally, this work contributes experimental results demonstrating how the crowd can be utilized to support complex sensemaking tasks. / Master of Science / Journalists rely on image and video verification to support their investigations and often utilize freely available tools to verify online and digital content. Currently, experts are involved in every step of this verification process, researching and confirming or refuting the claims of images or videos. Since experts often do not have access to custom tools, they rely on already existing tools, which do not always meet their needs. One type of image verification is geolocation, in which investigators work to identify the location where a photo or video was made. We aim to support this process through crowdsourcing. By enabling a large number of people, most with no experience or prior training, to help find the location, we can provide investigative journalists with efficient and complete verification of image locations. Multiple people searching at the same time speeds up the verification process as well as provides a more extensive search, all while allowing the expert to follow up on other leads or investigative work. We produced a software prototype called GroundTruth which enables novice individuals to support investigative journalists in determining the location of images and videos quickly and accurately. Additionally, this work contributes experimental results demonstrating how these individuals can collectively support complex sensemaking tasks.