The phrase "limitless horizon" means there are no boundaries or restrictions on what can be achieved or experienced. It represents the idea of endless possibilities and opportunities. Full definition
But there's also that vast sea to be crossed — there's that whole first semester, first year, stretched out to an apparently limitless horizon. (educationworld.com)
A lot of travel has kept me plugging away at Persona 4 Golden, and I dipped a toe into the seemingly limitless horizons of Monster Hunter Generations, but not to the extent that I can really comment on it beyond what Luke Shaw covered in his piece from early August. (waypoint.vice.com)
Gardner's landscapes, with their sense of almost limitless horizons, juxtaposed with his detailed portraits of Indian chiefs and tribal delegations, have a haunting specificity and gravity. (npg.si.edu)