visit

伺う(うかがう)	Lower person visits higher person.

参る(まいる)	Archaic, not much used anymore. Person visits temple. Feudal lord and his huge entourage visit a town.

訪ねる(たずねる)	An important person visits another important person (an official state visit, visit the pope, etc.)

訪問(ほうもん)	Same as たずねる, but this is the noun form.