st. mark's episcopal cathedral located at 231 e. 100 south in salt lake city, utah is the cathedral church of the diocese of utah in the episcopal church in the united states of america. built in 1871, it is the third oldest episcopal cathedral in the united states and the second oldest continuously used worship building in utah. it was designed by architect, richard upjohn, in the gothic revival style. on september 22, 1970, it was added to the national register of historic places.