Various systems, mediums, and methods herein describe aspects of an authentication system. The system may receive a request from a user device to authenticate a user. The system may determine a route traveled by the user. The route can be determined based at least on data retrieved from the user device of the user. The system may determine one or more objects viewable along the route. At least one image of the one or more objects can be selected. The system may communicate the at least one image and at least one other image to the user device to be displayed on the user device. The system may receive a selection of the at least one image by the user through a display of the user device. The authentication of the user can be based, at least in part, on the user selection of the at least one image.