These widen and deepen with time. They are fascinating places to visit and have their own unique photographic challenges. Canyons are dark places. Any photographer wanting large depth of focus will need to make long exposures necessitating the use of a tripod. Fast film will reduce exposure time at the expense of clarity.
High contrast is another problem to overcome in canyons.
Use of fill-in flash can assist in some areas. Add to all that, equipment must be transported in waterproof containers.