Merge real-world and virtual markers

Various entities might desire to leave markers at various locations in a mapping application for themselves and others. These markers can be provided by an entity physically located near the location associated with the marker and/or at a different location (e.g., entity is at a first location and the marker is associated with a second location). Further, different entities can provide markers associated with a similar geographic area. A user visiting the location (virtually or physically) can review the various markers left by others. In such a manner, the user visiting the location can have further details associated with the location. Different categories of markers can be combined and rendered to the user as a hybrid of markers.